to that we must look to see if the right claimed in a given case is within its terms. The Act of Congress provides, "that any person or persons having discovered or invented any new and useful art, machine, manufacture, or composition of matter, or any new and useful improvement on any art, machine, manufacture, or composition of matter not known or used by others before his or their discovery or invention thereof, and not, at the time of his application for a patent, in public use, or on sale with his consent or allowance as the inventor or discoverer," shall be entitled to receive a patent therefor. The true field of inquiry, in the present case, is to ascertain whether or not the alleged invention, set forth in this specification, is embraced within the scope of the Act. Very little light can be shed on our path by attempting to draw a practical distinction between the legal purport of the words "discovery" and "invention." In its naked ordinary sense, a discovery is not patentable. A discovery of a new principle, force, or law operating, or which can be made to operate, on matter, will not entitle the discoverer to a patent. It is only where the explorer has gone beyond the mere domain of discovery, and has laid hold of the new principle, force, or law, and connected it with some particular medium or mechanical contrivance by which, or through which, it acts on the material world, that he can secure the exclusive control of it under the patent laws. He then controls his discovery through the means by which he has brought it into practical action, or their equivalent, and only through them. It is then an invention, although it embraces a discovery. Sever the force or principle discovered from the means or mechanism through which he has brought it into the domain of invention, and it immediately falls out of that domain and eludes his grasp. It is then a naked discovery, and not an invention. These remarks are not made for the purpose of laying down sweeping general propositions. We are too well aware of the futility, or, we might say, mischief, of that practice of expounding the law of patents, to embark in it. But these suggestions are submitted for the purpose of showing the relation of the terms "discovery" and "invention," and especially the dependence of the former upon the latter, as used in the statute. Every invention may, in a certain sense, embrace more or less of discovery, for it must always include something that is new; but it by no means follows that every discovery is an invention. It may be the soul of an invention, but it cannot be the subject of the exclusive control of the patentee, or the patent law, until it inhabits a body, no more than can a disembodied spirit be subjected to the control of human laws. Now, that this patent contains the record of a discovery, there can be no doubt. And it is equally clear that, in a certain sense, it was new at or about the date of the patent. It is important here to ascertain precisely what that discovery was. It is described in general terms, in the first paragraph of the specification, to be "a new and useful improvement in surgical operations on animals." This is, at best, vague not from any fault of the person who drafted the schedule, but from the inherent difficulties of his task, and the imperfect nature of human language as an instrument of thought. But we can clearly gather from the paper itself what the discovery was; and we are aided in this by those parts of the specification which state what was old and well known. The second paragraph recites: "It is well known to chemists that when alcohol is submitted to distillation with certain acids, peculiar compounds, termed 'ethers,' are formed, each of which is usually distinguished by the name of the acid employed in its preparation." The origin and existence of ethers, those wonderful agents that produce a harmless insensibility to pain, formed no part of the discovery. No one of them was brought to light by these patentees, for they were all well known before. The same paragraph further sets forth that "it has also been known that the vapors of some, if not all, of these chemical distillations, particularly those of sulphuric ether, when breathed or introduced into the lungs of an animal, have produced a peculiar effect on the nervous system, one which has been supposed to be analogous to what is usually termed intoxication." It was not, then, the fact that these vapors could be introduced into the air-passages and lungs that was discovered. This was as old as respiration, or, at least, as old as the existence of the vapors. Neither was it discovered that, when inhaled, these vapors produced an effect like that of intoxication, exhilaration, and more or less stupefaction. This, too, had long been known. The next paragraph distinctly sets forth the real discovery that was made, namely, that this well-known inhalation of well-known agents (in increased quantities) would produce a state of the animal analogous to complete intoxication accompanied with total insensibility to pain. It appropriately adds: "This is our discovery." It is not important to inquire here whether this was the discovery of an increased and more perfect effect, the same in kind with that already well known, or whether it was the discovery of an entirely new effect. The effect discovered was produced by old agents, operating by old means upon old subjects. The effect alone was new, and to that only can the term "discovery" apply. That this mere discovery, however novel and important, is not patentable, needs neither argument nor authority to prove. This the specification impliedly concedes, for after thus clearly setting forth the discovery, a struggle is made to grapple it to something in active existence, and thus make the two, in this new special relation, a patentable invention. This is done by "combining it with, or applying it to, any surgical operation." "This is our invention." The beneficial effects described as resulting from the application, refer merely to the utility of the alleged invention, which is not in question, and may, therefore, be laid out of the case. The object of this combining the discovery with, or applying it to, surgical operations, is apparent. It was to shelter the discovery under those terms of the Patent Act which protect "any new and useful improvement on any art." It has clearly not the discovery or invention of an "art," or "machine," or "manufacture," or "composition of matter." Nor was it an "improvement" on any one of the last three. It was, therefore, called, in substance, an improvement in the art of surgery. But we cannot change a thing by a name. In a certain general sense, it is an improvement in the art of surgery. So would the invention of a new and useful lancet, saw, forceps, or bandage be an improvement on the same art. But the patent securing the exclusive sale or use of such an instrument must rest exclusively upon the novelty of its construction. It could borrow no element of patentability from the art in which it was designed to be used, except merely the element of utility. Of this latter the art would furnish the test. Now this discovery of the effect of ether on the patient, in holding him motionless and insensible during the operation, has the same legal relation to the art of surgery that a machine or other mechanical contrivance for holding him would have. It holds him better, stiller, and with less discomfort and danger to himself than any mechanism could; but its office is to hold and protect the patient. It has no other relation to, or connection with, the art of the surgeon. We use the word "protect" as applied to the patient in the largest sense, and as including not only exemption from pain during the operation, but also from the shock which such operations often give the system. The only legal quality or.aid, then, which this alleged invention can draw from the art with which it is connected in the specification, is that which relates to its utility. Of this it supplies undoubted evidence. The eminent surgeons who testified on the trial concurred in stating that its usefulness could not be overrated. We must, then, leaving the art of surgery to supply the evidence of its utility, contemplate the discovery as separated from the use to which it is applied. At this point the patent breaks down; for the specification presents nothing new except the effect produced by wellknown agents, administered in well-known ways on well-known subjects. This new or additional effect is not produced by any new instrument by which the agent is administered, nor by any different application of it to the body of the patient. It is simply produced by increasing the quantity of the vapor inhaled. And even this quantity is to be regulated by the discretion of the operator, and may vary with the susceptibilities of the patient to its influence. It is nothing more, in the eye of the law, than the application of a well-known agent, by well-known means, to a new or more perfect use, which is not sufficient to support a patent. But it was insisted on the argument that the claim at the close of the specification, when properly understood, disclosed the true character of the invention, and furnished ground upon which the patent can stand. This clause declares, that "what we claim as our invention is the hereinbefore-described means by which we are enabled to effect the above highly important improvement in surgical operations, viz.: by combining therewith the application of ether, or the vapor thereof, substantially as above described." The plaintiff's counsel insists that the true reading of the claim, in the light of the preceding part of the specification is not that which asserts a combination of the discovery with surgical operations, but rather an application of the discovery to surgical operations by the means described; "and that the means described, and the only means described, are the process of rendering the system insensible to pain by the inhalation of ether." But we do not discover that this exposition of the claim relieves the difficulty. What is the process which is here set forth? The process of inhalation of the vapor, and nothing else. To couple with it the effect produced by calling it a process of rendering the system insensible to pain, is merely to connect the results with the means. The means, that is the process of inhalation of vapors, existed among the animals of the geologic ages preceding the creation of our race. That process, in connection with these vapors, is as old as the vapors themselves. We come, therefore, to the same point, only by a different road. We have, after all, only a new or more perfect effect of a well-known chemical agent, operating through one of the ordinary functions of animal life. Before dismissing this case, it may not be amiss to speak of the character of the discovery upon which the patent is founded. Its value in securing insensibility during the surgical operation, and thus saving the patient from sharp anguish while it is proceeding, and mitigating the shock to his system, which would otherwise be much greater, was proved on the trial by distinguished surgeons of the city of New York. They agreed in ranking it among the great discoveries of modern times; and one of them remarked that its value was too great to be estimated in dollars and cents. Its universal use, too, concurs to the same point. Its discoverer is entitled to be classed among the greatest benefactors of mankind. But the beneficent and imposing character of the discovery cannot change the legal principles upon which the law of patents is founded, nor abrogate the rules by which judicial construction must be governed. These principles and rules are fixed, and uninfluenced by shades and degrees of comparative merit. They secure to the inventor a monopoly in the manufacture, use, and sale of very humble contrivances, of limited usefulness, the fruits of indifferent skill, and trifling ingenuity, as well as those grander products of his genius which confer renown on himself, and extensive and lasting benefits on society. But they are inadequate to the protection of every discovery, by securing its exclusive control to the explorer to whose eye it may be first disclosed. A discovery may be brilliant and useful, and not patentable. No matter through what long, solitary vigils, or by what im portunate efforts, the secret may have been wrung from the bosom of Nature, or to what useful purpose it may be applied. Something more is necessary. The new force or principle brought to light must be embodied and set to work, and can be patented only in connection or combination with the means by which, or the medium through which, it operates. Neither the natural functions of an animal upon which or through which it may be designed to operate, nor any of the useful purposes to which it may be applied, can form any essential parts of the combination, however they may illustrate and establish its usefulMotion for a new trial denied. ness. 223. AMERICAN BELL TELEPHONE COMPANY v. DOLBEAR UNITED STATES CIRCUIT COURT, DISTRICT OF MASSACHUSETTS. 1883 IN EQUITY. 15 Fed. 448 Chauncey Smith and James J. Storrow, for complainants. GRAY, Justice. Few legal rules have been oftener misunderstood and misapplied than the maxim that you cannot patent a principle. But the confusion on this subject has been so effectually cleared up by the recent judgment of the Supreme Court, delivered by Mr. Justice BRADLEY, in Tilghman v. Proctor, 102 U. S. 707, that it will be sufficient for the purposes of this case to state the conclusions there announced. There can be no patent for a mere principle. The discoverer of a natural force or a scientific fact cannot have a patent for that. But if he invents for the first time a process by which a certain effect of one of the forces of nature is made useful to mankind, and fully describes and claims that process, and also describes a mode or apparatus by which it may be usefully applied, he is, within the meaning and the very words of the patent law, "a person who has invented or discovered any new and useful art"; and he is entitled to a patent for the process of which he is the first inventor, and is not restricted to the particular form of mechanism or apparatus by which he carries out that process. Another person, who afterwards invents an improved form of apparatus, embodying the same process, may indeed obtain a patent for his improvement, but he has no right to use process, in his own or any other form of apparatus, without the consent of the first inventor of the process. It was decided by this Court in American Bell Telephone Co. v. Spencer, 8 Fed. Rep. 509, and is not denied by the present defendant, that Bell is the first inventor of a speaking telephone. The only controversy is the extent of his patent. The draughtsman of the specifications has exhibited as clear and accurate a comprehension of the |