340 INDEX. 
Hooke, Dr., his description of the pulvilli of flies, 217: the 
viscid globules in the nets of geometric spiders seen by, 
299. 
Illusion, optical, instance of, 288. 
Imitation, faculty of, possessed by some birds, 32, 34, 142. 
Insects, ravages of, 207: larve of, 211: experiments with, 219, 
220, 222. 
Instincts of birds, 115: dependent upon physical causes, 125: 
of the Cuckoo, 73: of spiders, 276. 
Intelligence of birds exemplified, 122, 127, 134, 138, 139, 
142. 
Jackdaw sometimes builds in deserted rabbit-burrows, 128. 
Jenner, Dr., abstract of his history of the Cuckoo, 50: has ad- 
verted to the occasional desertion of their progeny by the 
Swallow and House-Martin, 85: cause assigned erroneous, 
95, 98: his theory of migration, 95: views combated, 
95. 
Kirby and Spence, Messrs., their account of the fabrication of 
the nets of geometric spiders the most circumstantial, 
277: difficulties left without explanation, 282, 254: state 
that the net of the Garden-Spider is composed of two Kinds 
of silk, 300. 
Kitten brought up by a Spaniel, 205. 
Knowledge, actjuired, instances of, in birds, 122, 135, 189, 
142. 
Language of birds, 29. 
Larve, the prolegs of such as can adhere to polished bodies do 
not act as suckers, 212. 
Leach, Dr., his account of the moulting of spiders, 305. 
Lister, Dr., his hypothesis to account for the ascent of aéronautic 
spiders, 266: supposed that the peculiarity in the net of 
Epeira calophylla occurs invariably, 282: thought that 
spiders can retract their lines within the abdomen, 287: 
was acquainted with the true nature of the palpal organs, 
313. 
Lycosa saccata an aéronautic spider, 274. 
Martin, House-, has frequently two broods in a summer, 14, 86: 
sometimes deserts its progeny, 86, 96. 
——, Sand-, sometimes abandons its progeny, $9. 
