INDEX. 
Abstinence of spiders, 272, 326. 
Adhesive lines of spiders, 279, 281, 292. 
Air, rarefied, singular effects of, 260, 261, 262. 
Air-pump, experiments with, 212, 220. 
Animals, certain species of, can ascend the vertical surfaces of 
dry polished bodies, 211, 216, 224, 225, 301: phenomenon 
investigated, 211, 219, 222, 226, 302: advantages to be de- 
rived from a knowledge of their instincts, 117. 
Apparatus, climbing-, its structure and function, 217, 221, 302, 
303, 304; carding-, or calamistrum, its structure and use, 
293, 294, 295: spinning-, structure and function of its 
superior ‘mammule when greatly elongated, 320, 321: 
structure and function of its inferior mammule when there 
are four pairs, 319. 
Audebert, M., his observations on the House-spider supported by 
collateral evidence, 316. 
Audubon, Mr., his remark on the song of the Grenadier Gros- 
beak, 174. 
Barrington, Honourable Daines, his experiments and observations 
on the singing of birds examined, 31: inconclusiveness of 
his deductions, 33. 
Beetles, aquatic, tarsal suckers of, 221. 
Bewick’s Swan, notice of, 152: specimen of, shot near Middleton, 
153: anecdote of, 155. 
Bill, remarkable formation of, 157. 
Birds, notes of, observations on, 26: importance of an acquaint- 
ance with, 28: are uttered instinctively, 40,120: the songs 
of, by what occasioned, 42, 120: not liable to become tor- 
pid, 112, 114: attachment to their offspring, 91, 183: de- 
scriptions of Fulca Auduboni, 178, Lamprotornis Vigorsti, 
181, 
Z 
