INDEX. 347 



the labour of hatching and bringing up her young, choos- 

 ing a place remote from the cock, iv. 123, &c. 



Powisland, in Wales, for many ages famous for a swift and 

 generous race of horses, and why, ii. 199. 



Powters, a variety of the tame pigeon, iv. 240. 



Pregnancy of some women found to continue a month beyond 

 the usual time, i. 384. Of all animals, in point of time, 

 is proportioned to their size, ii. 172. 



Pressure, perpendicular in rivers, always in exact proportion 

 to the depth, i. 173. 



Prey, all the males of these birds are a third less, and weaker 

 than the females, iv. 67. See Birds. 



Pricket, name hunters give the buck the second year, ii. 329. 



Prickly-finned fishes, their description, v. 118. 



Propagation of gnats, one of the strangest discoveries in na- 

 tural history, vi. 165. A new kind lately discovered in a 

 most numerous tribe of animals, propagated by cuttings, 

 173. Different manners of that operation in the polypi, 

 to the astonishment of the learned of Europe, 174. 



Propolis, a resinous gum, with which the bees plaster the 

 inside of their hives, vi. 98. 



Proportion of the human figure, little known with precision 

 in regard to it; different opinions upon the subject, i. 432. 



Ptarmigan, sort of grouse, chiefly found in heathy mountains 

 and piny forests, at a distance from mankind ; size and 

 colour, iv. 161. 



Phthiriasis, the lousy disease, frequent among the ancients ; 

 principal people who died of this disorder ; plants and ani- 

 mals are infested with diseases of this kind ; a vegetable 

 louse from America overrun all the physic-garden at Ley- 

 den ; the leaf-louse described ; the males have four wings, 

 the females never have any ; when they perceive the ant 

 behind them, they kick back with their hind-feet ; three 

 principal and constant enemies to these insects, v. 413. 



Puffin, or Coulterneb, marks that distinguish this bird ; its 

 residence ; migrations ; found by hundreds cast away upon 

 shores lean and perished with famine ; lays one egg ; few 

 birds or beasts venture to attack its retreats ; in what man- 

 ner it defends itself against the raven ; the Manks puffin is 

 itself one of the most terrible invaders ; instances of it ; 

 places which abound with them ; in what manner their 

 young are fed ; their food ; formerly their flesh was allowed 

 by the church on lenten days ; they bite extremely hard, 

 and keep such hold of what they seize, as not to be easily 

 disengaged ; their noise when taken very disagreeable, like 

 the efforts of a dumb person attempting to speak ; quantity 

 of oil in their bodies, iv. 397. 



Purre, a small bird of the crane kind, with a shorter bill, and 

 thighs bare of feathers, iv. 340. 



