GENERAL EXPLANATION OF TABLES.

Persons of native birth have been divided into two general groups and further subdivided under each of the two, as follows:

1. Native-born of native father.-Persons under this group are classified as White, Negro, Indian, Chinese, Hindu, Japanese, and Korean.

2. Native-born of foreign father.-Persons under this group are further classified according to race of father. The classification by race (or people) is that used for several years by the United States Bureau of Immigration and Naturalization.

Persons of foreign birth are classified according to race (or people). The classification of the United States Bureau of Immigration and Naturalization is followed.

Throughout the study information is presented:

1. By general nativity and race of the "individual" in all tables which show facts which are personal in their nature, such as English speaking, occupation, or conjugal condition.

2. By general nativity and race of "head of family" in tables concerned with family matters; for example, family income.

3. By general nativity and race of "head of household " in all tables dealing with living conditions, among which are tables showing the composition of the household and the number of persons per room and per sleeping room. The distinction which has been made throughout this study between "family" and "household " is dependent upon the use of the term "apartment."

An "apartment" is a room or rooms within which all the usual daily processes of living, namely, cooking, eating, and sleeping, are carried on by the occupants. According to this definition an apartment may be, for example, a whole house, or it may be a single room of what was originally intended as an apartment, or it may be a corner of a wareroom or the back of a storeroom partitioned off and set aside for household uses. Two or more groups of occupants with distinctly separate money interests frequently rent a number of rooms jointly, occupying certain rooms separately but sharing one or more, usually the kitchen or kitchen and living room. Under these conditions neither the rooms used by the one group of occupants nor those used by the other can be considered an apartment, since the room used in common must in such case be considered a room in each apartment and thus be counted twice. Where these conditions have been encountered the entire number of rooms has been considered one apartment.

The "household " includes all persons living within an apartment without regard to the relationships which exist among them. The household may consist of one or more families with or without boarders or lodgers; or it may consist of a group of persons living together, no family included; or it may consist of various combinations of families, " groups," and boarders or lodgers.

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The term "family as used throughout these tables refers in general to the immediate family composed of husband, wife, and children. Groups of persons among whom none of these relations exist are not considered families. Households in which complicated relationships exist have been resolved into the component immediate families. Remnants of families maintaining a home are considered families when either husband or wife is present.

Number of households in each block or district, by general nativity and race of head of household.-Tables 1, 58, 107, 156, 213, 270, 320. These tables record the number of households in each block or district canvassed and the total number of persons in households.* Households are classified according to the general nativity and race of head of household; the total number of persons in blocks or districts is shown regardless of general nativity and race.

Total number of households and persons studied, by general nativity and race of head of household.-Tables 2, 59, 108, 157, 214, 271, 321, 369.

These tables enumerate the households studied of each race, the aggregate of the members of the households of each race, and the persons, male and female, who are included in the detailed study of members of households. Áll members of households appear in these tables under the general nativity and race of head of household.

Number and class of households, by general nativity and race of head of household.-Tables 3, 60, 109, 158, 215, 272, 322, 370.

All households are here divided into " family households," or households where a family is present, and "group households," or households composed of a group of persons, no family included. Family households are further classified as being with or without boarders or lodgers. Family households with neither boarders nor lodgers are subdivided into those consisting of a single family and those consisting of two or more families living in the same apartment and sharing one or more rooms. Family households with boarders or lodgers are subdivided into those who keep boarders and those who keep only lodgers. Households keeping both boarders and lodgers are here entered as households with boarders. "Boarders" are persons to whom both food and lodging are furnished.

Country of birth of foreign-born heads of households, by sex and race of individual.-Tables 4, 61, 110, 159, 216, 273, 323, 371.

The heads of households of the several races are here classified according to the country of their nativity, which, with the exception of a very few cases, is the country in which they lived until coming to the United States.

Province of birth of South Italian heads of households, by sex of individual.-Tables 4a, 61a, 110a, 159a, 216a, 273a, 323a, 371a.

The heads of households of the South Italian race are here classified according to the province of their nativity, which, with the exception of a very few cases, is the province in which they lived until coming to the United States.

Number of persons for whom detailed information was secured, by sex and general nativity and race of individual.-Tables 5, 160, 217. These tables are a second enumeration of the persons, male and female, who are included in the detailed study of members of households. In this enumeration each individual appears under his own general nativity and race.

Age of heads of households, by sex and general nativity and race of individual.-Tables 6, 62, 111, 161, 218, 274, 324, 372.

These tables give the number of heads of households of each sex who report their ages as under 20 years, 20 to 29 years, 30 to 44 years, 45 to 59 years, and 60 years or over.

Number of persons within each age group, by sex and general nativity and race of head of household.-Tables 7, 63, 112, 162, 219, 275, 325, 373.

These tables give for all households studied the number of persons of each sex who report their ages as under 6 years, 6 to 13 years, 14 and 15 years, 16 to 19 years, 20 to 29 years, 30 to 44 years, and 45 years or over. Persons whose race or nativity differs from the head of the household appear in these tables under the race and nativity of the head.

Conjugal condition, by sex, age groups, and general nativity and race of individual.-Tables 8, 163, 220.

These tables include persons 16 years of age or over. Such persons are classified in four groups according to age, and the persons in each group are further classified according to whether they are single, married, or widowed. With the widowed are included the relatively few persons who are deserted, divorced, or separated.

Number of foreign-born male heads of households in the United States each specified number of years, by race of individual.-Tables 9, 64, 113, 164, 221, 276, 326, 374.

All foreign-born male heads of households who report the number of years since their first arrival in the United States are here classified as in the United States under 1 year, 1 year, 2 years, 3 years, 4 years, 5 to 9 years, 10 to 14 years, 15 to 19 years, or 20 years or over. Number of foreign-born persons in the United States each specified number of years, by sex and race of individual.-Tables 10, 165, 222. These tables are similar to Tables 9, 64, 113, 164, 221, 276, 326, 374, relating to male heads of housholds.

Number of persons per household in apartments of each specified size, by general nativity and race of head of household.-Tables 11, 65, 114, 166, 223, 277, 327.

Households are here classified according to the number of rooms which they occupy and are further classified according to the number of persons of which they are composed. Rooms used exclusively for business purposes, although connected with the apartment, are not counted in the number of rooms per apartment as before stated. Only such persons as sleep in the apartment are considered members of the household. The tabulation is by the general nativity and race of head of household.

Number of households occupying apartments of each specified number of rooms, by general nativity and race of head of household. Tables 12, 66, 115, 167, 224, 278, 328, 375.

These tables are a summary of a part of the data of Tables 11, 65, 114, 166, 223, 277, 327. Households are classified here according to the number of rooms they occupy.

Number of households of each specified number of persons, by general nativity and race of head of household.-Tables 13, 67, 116, 168, 225, 279, 329, 376.

These tables are a summary of a part of the data in Tables 11, 65, 114, 166, 223, 277, 327. Households are classified here according to the number of their members.

Number of households and number of persons in apartments of each specified number of rooms, by general nativity and race of head of household.-Tables 14, 68, 117, 169, 226, 280, 330, 377.

These tables are a summary of a part of the data in Tables 11, 65, 114, 166, 223, 277, 327. They give the total number of households and the total number of persons in apartments of each specified size. Number of households which have each specified number of persons per room, by general nativity and race of head of household.Tables 15, 69, 118, 170, 227, 281, 331, 378.

These tables show the number of households which average less than one person per room, one and less than two persons per room, two and less than three persons per room, etc. These tables also give the average number of persons per household and per room for all households studied. The data are presented by the general nativity and race of head of household.

Number of households which have each specified number of persons per sleeping room, by general nativity and race of head of household.-Tables 16, 70, 119, 171, 228, 282, 332, 379.

These tables present the data relative to persons per room regularly used for sleeping purposes. These tables are similar to Tables 15, 69, 118, 170, 227, 281, 331, 378.

Number of households which have each specified number of adults per room, by general nativity and race of head of household.-Tables 17, 71, 120, 172, 229, 283, 333, 380.

These tables show the number of households which average less than one adult per room, one and less than two adults per room, two and less than three adults per room, etc. These tables also give the average number of adults per household and per room for all households studied. The term "adult" as used in this series of tables is equivalent to one person 10 years of age or over, or two persons under 10 years of age.

Number of households which have each specified number of adults per sleeping room, by general nativity and race of head of household.-Tables 18, 72, 121, 173, 230, 284, 334, 381.

These tables present the data relative to adults per room regularly used for sleeping purposes. The tables are similar to Tables 17, 71, 120, 172, 229, 283, 333, 380.

Number of foreign households which have each specified number of adults per room, by race of head of household and by years head has been in the United States.-Tables 19, 73, 122, 174, 231, 285, 335, 382. Households are here separated into three groups according to the number of years since the first arrival of the head in the United States and are further classified according to the number of adults per room after the manner of Tables 17, 71, 120, 172, 229, 283, 333, 380.

Number of foreign households which have each specified number of adults per sleeping room, by race of head of household and by years head has been in the United States.-Tables 20, 74, 123, 175, 232, 286, 336, 383.

Households are here separated into three groups according to the number of years since the first arrival of the head in the United

States and are further classified according to the number of adults per sleeping room after the manner of Tables 18, 72, 121, 173, 230, 284, 334, 381.

Number of households regularly sleeping in all except each specified number of rooms, by general nativity and race of head of household.-Tables 21, 75, 124, 176, 233, 287, 337, 384.

These tables classify households according to the number of rooms left for living purposes, after the number of sleeping rooms has been deducted.

Number of households keeping boarders or lodgers and number of boarders and lodgers, by general nativity and race of head of household.-Tables 22, 76, 125, 177, 234, 288, 338, 385.

These tables show the number of households keeping boarders and the number keeping only lodgers; they also show the total number of boarders and of lodgers. The facts are shown under the race of the head of the household. "Boarders" both sleep and eat with the household. Households which keep lodgers in addition to boarders are classified with the households keeping boarders. Among certain races it is customary to include one of the following accommodations with the nominal price of lodging: (1) Coffee or soup is served once a day; (2) the lodger is allowed the privilege of cooking his food on the kitchen stove; (3) the housewife buys the lodger's food having the price charged in his account book, and prepares the food for him. Persons with each of the above financial arrangements consider themselves lodgers and have been classified as such in these tables.

Number of foreign households keeping boarders or lodgers, by race of head of household and by years head has been in the United States.-Tables 23, 77, 126, 178, 235, 289, 339, 386.

Households are here classified in three groups according to the number of years since the head of the household first came to the United States, and for each group the number of households keeping boarders or lodgers is given. The data are tabulated by the race of head of household.

Gainful employment pursued in apartment, by general nativity and race of head of household.-Tables 24, 78, 127, 179, 236, 290,

340.

These tables give for each apartment in which gainful employment is pursued the kind of employment, the sex and standing in the household of all persons engaged therein, and the total amount of earnings in the apartment for the year ending at the time the schedule was taken. Rooms used exclusively for business purposes have not been counted in the number of rooms per apartment.

The occupations listed here, therefore, are carried on in rooms which are used for living purposes.

Number of apartments in which each specified amount per year is earned, by employment pursued and by general nativity and race of head of household.-Table 291. This table summarizes the data in Table 290.

Number of households where water supply is used by each specified number of households, by general nativity and race of head of household.-Tables 25, 79, 128, 180, 237, 292, 341, 388.

Each household is here classified according to the number of households using the source of water supply to which it has access.