XX. On the Physiological Action of Vanadium. By John Priestley, Platt Physio- 
logical Scholar at Owens College , Manchester. Communicated by Professor 
Arthur Gamgee, F.B.S. page 495 
XXL Contributions to the Minute Anatomy of the Thyroid Gland of the Bog. By 
E. Cresswell Baber, M.B. Bond. Communicated by Br. Klein, F.B.S. . 557 
XXII. On the Placentation of the Lemurs. By William Turner, M.B. ( Bond .), Pro- 
fessor of Anatomy in the University of Edinburgh. Communicated by Professor 
Huxley, Sec.B.S 569 
XXIII. Experiments on the Friction between Water and Air. By Br. Viktor von Lang, 
Professor of Physics in the University of Vienna. Communicated by N. S. Mas- 
kelyne, M.A., F.B.S., Professor of Mineralogy in the University of Oxford. 589 
XXIV. On the Structure and Bevelopment of the Skull in the Batrachia . — Part II. 
By William Kitchen Parker, F.B.S. 601 
XXV. On determining the Bepth of the Sea without the use of the Sounding-line. By 
C. William Siemens, F.B.S., B.C.L., Mem.Bnst.C.E. 671 
XXVI. Electrodynamic Qualities of Metals (continued from Phil. Trans. Vol. 146. 
Bead Feb. 28, 1856). — Part VI. Effects of Stress on Magnetization. By Sir 
William Thomson, F.B.S. &c 693 
XXVII. On the Nature of the Force producing the Motion of a Body exposed to Bays 
of Beat and Light. By Arthur Schuster, Ph.B., Bemonstrator in the Physical 
Laboratory of Owens College. Communicated by Baleour Stewart, F.B.S. 715 
XXVIII. On the Forces caused by the communication of Heat between a Surface and a 
Gas ; and on a New Photometer. By Professor Osborne Beynolds. Commu- 
nicated by B. Stewart, F.B.S., Professor of Natural Philosophy in Owens 
College, Manchester 725 
Index 737 
