CONTENTS 
I. The Bakerian Lecture. — On the Diffusion of Liquids. By Thomas Graham, 
F.R.S., F.C.S. page 1 
II. On the Nitrogenated Principles of Vegetables as the Sources of Artificial Alkaloids. 
By Dr. John Stenhouse, F.R.S. 47 
III. On the Mechanical Equivalent of Heat. By James Prescott Joule, F.C.S. , 
Sec. Lit. and Phil. Society, Manchester, Cor. Mem. R.A., Turin, 8^c. Commu- 
nicated by Michael Faraday, D.C.L., F.R.S. , Foreign Associate of the Aca- 
demy of Sciences, Paris, 8fc. 8fc. 8fc 61 
IV. On the Automatic Registration of Magnetometers, and Meteorological Instru- 
ments, by Photography. — No. III. By Charles Brooke, M.B., F.R.S. . 83 
V. Researches regarding the Molecular Constitution of the Volatile Organic Bases. 
By Dr. A. W. Hofmann, F.C.S., Professor of the Royal College of Chemistry 
of London. Communicated by Sir James Clark, Bart., F.R.S 93 
VI. On the Development of the Great Anterior Veins in Man and Mammalia ; 
including an Account of certain remnants of Fcetal Structure found in the 
Adult, a Comparative View of these Great Veins in the different Mammalia, 
and an Analysis of their occasional peculiarities in the Human Subject. By 
John Marshall, F.R.C.S., late Demonstrator of Anatomy in University College, 
London; Assistant Surgeon to the University College Hospital. Communi- 
cated by Professor Sharpey, F.R.S. 133 
VII. Experimental Researches in Electricity . — Twenty-third Series. By Michael 
Faraday, Esq., D.C.L., F.R.S., Fiillerian Prof. Chem. Royal Institution, 
Foreign Associate of the Acad. Sciences, Paris, Ord. Boruss. Pour le M^rite, 
Eq., Memb. Royal and Imp. Acadd. of Sciences, Petersburgh, Florence, Copen- 
hagen, Berlin, Gottingen, Modena, Stockholm, Munich, Bruxelles, Vienna, 
Bologna, <^c. 8^c 171 
VIII. On the Development of the Retina and Optic Nerve, and of the Membranous 
Labyrinth and Auditory Nerve. By Henry Gray, M.R.C.S. Communicated 
by W. Bowman, F.R.S., Professor of Physiology and of General and Morbid 
Anatomy in Kings College, London 189 
