[ iv ] 
XXIII. The Croonian Lecture.— On the Rhythm of the Heart of the Frog, and on 
the Nature of the Action of the Vagus Nerve. By W. H. Gaskell, M.D., 
Cant. Communicated by Dr. Michael Foster, Sec. R.S., from the Physio¬ 
logical Laboratory, Cambridge . 993 
XXIV. An Attempt at a complete Osteology of Hypsilopliodon Foxii; a British 
Wealden Dinosaur. By J.W. Hulke, F.R.S. . 1035 
XXV. The Minute Anatomy of the Thymus. By Herbert Watney, M.A., M.D., 
Cantab ., Joint Lecturer on Physiology at St. George’s Hospital. Communi¬ 
cated by E. A. Schafer, F.R.S., Assistant Professor of Physiology in Univer¬ 
sity College, London . 1063 
XXVI. On the Effects of Heat on certain Haloid Compounds of Silver , Mercury, 
fjead, and Copper . By G. F. Bodwell, Science Master in Marlborough Col¬ 
lege. Communicated by Professor A. W. Williamson, For. Sec. R S. . 1125 
XXYII. On the Specific Heat and Heat of Transformation of the Lodide of Silver, 
Agl, and of the Alloys Cu 2 I 2 .AgI ; 'Cu 2 I 2 .2AgI; Cu 2 I 2 .3AgI; Cu 2 I 2 .4AgI; 
Cu 2 T 2 .12AgI; PbI 2 .AgI. By Professor Manfredo Bellati and Dr. B. 
Bomanese, of the University of Padua. Communicated by Professor A. W. 
Williamson, Foreign Secretary R.S .1169 
Index to Part III. .. . . 1177 
