CONTENTS. 
XII. An Account of Meteorological Observations in Four Balloon Ascents, made 
under the direction of the Kew Observatory Committee of the British Association 
for the Advancement of Science. By John Welsh, Esq. Communicated by 
Colonel Sabine, R.A., Treas. and F.P.R.S., by the request of the Council of the 
British Association for the Advancement of Science 311 
XIII. On certain Functions of the Spinal Chord, with further Investigations into its 
Structure. By J. Lockhart Clarke, Esq. Communicated by Samuel Solly, 
Esq., F.R.S 347 
XIV. On the Thermal Effects of Fluids in Motion. By William Thomson, M.A., 
F.R.S., F.R.S. E., 8^c., Professor of Natural Philosophy in the University of 
Glasgow, For. Mem. of the Royal Swedish Academy of Sciences ; and J. P. Joule, 
F.R.S., F.C.S., Corr. Mem. R.A. Turin, Vice-President of the Literary and 
Philosophical Society of Manchester, 8fc 357 
XV. On the Anatomy and Physiology of Cordylophora, a contribution to our know- 
ledge of the Tubularian Zoophytes. By George James Allman, M.D., 
M.R.I.A., Professor of Botany in the University of Dublin, and Examiner in 
Zoology and Botany in the Queens University in Ireland. Communicated by 
Professor Edward Forbes, F.R.S 367 
XVI. On the Change of Ref rangibility of Light. — No. II. By G. G. Stokes, M.A., 
F.R.S., Fellow of Pembroke College, and Lucasian Professor of Mathematics 
in the University of Cambridge 385 
XVII. On the Secular Variation of the Moon's Mean Motion. By J. C. Adams, Esq., 
M.A., F.R.S. 8^c 397 
