[ Vli ] 
XVIII. Contributions to the Anatomy of the Central Nervous System in Vertebrate 
Animals. By Alfred Sanders, M.R.G.S., F.L.S. Communicated by Dr. 
Gunther, F.R.S. . page 733 
XIX. The Coefficient of Viscosity of Air. By Herbert Tomlinson, B. A. Com¬ 
municated , with the addition of two Notes, by Professor G. G. Stokes, 
P.R.S. . 767 
XX. The Influence of Stress and Strain on the Physical Properties of Matter. By 
Herbert Tomlinson, B.A. Communicated by Professor W. Grylls Adams, 
M.A., F.R.S .. 801 
Index to volume 
839 
