536 INDEX. 



Hottentots. Their mode of training and inftrufting oxen, 457. 



Hauter, Mr John. His account of the refpiration of birds, in. His defcription of the 



free-martin, 242. 

 Hymenopterous infefts. Their form and manners, 94. 



I 



Ichneumon flies. See flies and bees. 



Imitation. Its effects upon animals as a principle, 469. 



Infancy. See infants. 



Intelleft. The degrees of it extremely varied both among men and other animals, 521. 



Infants. They underftanJ language before they can fpeak, 157. Hear bluntly, 169. 

 Are fond of noife, 170. Invent, at the age of nine or twelve months, an artificial 

 language, 173, 272. The condition of human infants confidered as miferable, 196. 

 This notion invalidated, 197. Fond of motion, 198. The methods of managing 

 them by favages, 199; and by northern nations, ibid. Are lefs affefled by cold than 

 at any other period, 20 r. Their lives very precarious, ibid. Caufes of their difeafes 

 and mortality, 202. Sleep, for feveral vreeks, almoft continually, 203. Their me- 

 mory weak, and why, ibid. Duration of infancy in different animals, 204. Infant 

 ftate of birds fliort, 205. Infancy of fifhes, ibid. Of infefts, ibid. The ftrong at- 

 tachment of parents to their young, 207. 



Infefts. A fketch of their fl:rufture, l5, 17. A more enlarged view of it, 83. Divi- 

 fion of infefts from their wings, 83. Ufe of their feelers, 84. Undergo three 

 changes of form, 85. Some of them endowed with the fenfe of fmelling, 86 ; and 

 fome probably with that of hearing, 87. Account of their probofcis, 88. Of the 

 form and manners of the beetle tribe, 89. Of the form and manners of the hemip- 

 terous tribe, 90. Of neuropterous infefts, 93. Of hymenopterous infedls, 94. Of 

 dipterous infefts, 96. Of apterous infe£ls, 97. Of the refpiration of infers, 118. 

 Examples of their infl:inas, 146. Infefts have few inftinfts, 155. Thofe that feed 

 upon carrion never attack live animals, 223. Great differences between fome male 

 and female infefts, 239, 240, 241. Defcription of the form and manners of gall- 

 infefts, 240. Infefts fuppofed to impregnate certain plants, 250. Changes they un- 

 dergo before their age of puberty, 268. Some of them have a ftrong affeilion to 

 their young, 275- Of their transformations, 290. Lives of winged infefts confifts 

 of three principal periods, 293. Their internal parts changed after transformation, 

 20''. The behaviour of different caterpillars when about to transform, 298. Their 

 transformation is only the throwing off temporary coverings, 301. Nefts of various 

 infefts defcribed, 326. Some of them are rapacious, 383. Thoufands of them daily 

 devoured by cattle, 390. Ir.feiSls afford many inliances of affociation, 421. Some 



of them migrate, 503. Are fhort lived, 516. 



Infpiration. 



