CONTENTS. III. CLASSIFIED LIST OF EXPIRED PATENTS. Classified List of Patents that have expired in the year 1851... I.-Agriculture, including Implements and Operations.... II.-Metallurgy and Mar.ufacture of Metals............. III.-Manufacture of Fibrous and Textile Substances.. IV.-Chemical Processes, Manufactures, and Compounds. V.-Calorifics, comprising Lamps, Fire-places, Stoves, &c...... VIII.-Mathematical, Philosophical, and Optical Instruments.... |