460 NATURAL HISTORY. 



women. Some differ in faculty, as the cocks amongst 

 singing-birds are the best singers. The chief cause of 

 all these, no doubt is, for that the males have more 

 strength of heat than the females, which appeareth 

 manifestly in this, that all young creatures males are 

 like females, and so are eunuchs, and gelt creatures 

 of all kinds, liker females. Now heat causeth great 

 ness of growth, generally, where there is moisture 

 enough to work upon : but if there be found in any 

 creature, which is seen rarely, an over-great heat in 

 proportion to the moisture, in them the female is the 

 greater, as in hawks and sparrows. And if the heat 

 be balanced with the moisture, then there is no dif 

 ference to be seen between male and female, as in 

 the instances of horses and dogs. We see also, that 

 the horns of oxen and cows, for the most part, are 

 larger than the bulls, which is caused by abundance 

 of moisture, which in the horns of the bull faileth. 

 Again, heat causeth pilosity and crispation, and so 

 likewise beards in men. It also expelleth finer 

 moisture, which want of heat cannot expel ; and that 

 is the cause of the beauty and variety of feathers. 

 Again, heat doth put forth many excrescences, and 

 much solid matter, which want of heat cannot do ; 

 and this is the cause of horns, and of the greatness of 

 them, and of the greatness of the combs and spurs 

 of cocks, gills of turkey-cocks, and fangs of boars. 

 Heat also dilateth the pipes and organs, which causeth 

 the deepness of the voice. Again, heat refineth the 

 spirits, and that causeth the cock singing-bird to 

 excel the hen. 



