INDEX. 
523 
Thermometrical Observations made at the Apartments of the Royal Society, reduction of, 307. 
Thylacinus cynocephalus, on the dental tissues of, 409. 
Tomes (John, Esq.). On the Structure of the Dental Tissues of Marsupial Animals, and more 
particularly of the Enamel, 403. 
Tongue, minute structure of the papillae and nerves of, in the Frog and Toad, 139. Tongue of 
the Frog, 139. Vibratile cilia and rugm, 141. Conical papillae, 142. Nerves of, 145. Nerves 
of the inferior surface of the tongue, 146. Mucous follicles, 146. Tongue of the Toad, 147. 
Tortoise, thoracic segment of, compared with that of Birds, 157, — and with that of the Crocodile, 
158. 
Transpiration of Gases, 349. 
U. 
Urine, Contributions to the Chemistry of, 235. I. On the variations in the acidity of the urine 
in a state of health, 235. II. On the simultaneous variations of the amount of uric acid and 
the acidity of the urine in a healthy state, 245. On the deposit of urates in the urine, 251. 
III. Variation of the sulphates in the urine in a healthy state, and on the influence of sul- 
phuric acid, sulphur and the sulphates, on the amount of sulphates in the urine, 252. On 
the influence of caustic potash, tartaric acid and the tartrate of potash, on the acidity of the 
urine, 265. 
V. 
Voltaic Ignition, eflPect of surrounding media on, 49. 
W. 
Waller (Dr. A.). Minute Structure of the Papilla of the Tongue of the Frog and Toad, 139. 
Wax, Investigation on the Chemical Nature of. III., 91. Myricin, 91. Melissin, 93. Melissic 
acid, 94. Chlor-melal, 95. Palmitic acid from the saponification of myricin, 96. Distillation 
of myricin, 98. Palmitic acid from the distillation of myricin, 98. Melen, 99. 
Williamson (W. C., Esq.). On the Microscopic Structure of the Scales and Dermal Teeth of 
some Ganoid and Placoid Fish, 435. 
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