4G8 JTOVIIM ORGANUM. [bOOK IL 



6. Manures, such as every kind of dung, chalk, sea-sand, sail* 

 and the like, have some disposition towards heat. 



7. All putrefaction exhibits some slight degree of heat, though 

 not enough to be perceptible by the touch ; for neither the sub- 

 stances which by putrefaction are converted into animalculse,'' as 

 flesh and cheese, nor rotten wood which shines in the dark, are 

 warm to the touch. The heat, however, of putrid substances 

 displays itself occasionally in a disgusting and strong scent. 



8. The first degree of heat, therefore, in substances whicli are 

 warm to the human touch appears to be that of animals, and this 

 admits of a great variety of degrees, for the lowest (as in insects) 

 is scarcely perceptible, the highest scarcely equals that of the 

 sun's rays in warm climates and weather, and is not so acute as 

 to be insufferable to the hand. It is said, however, of Constan- 

 tius, and some others of a very dry constitution and habit of 

 body, that when attacked with violent fevers, they became so 

 warm as to appear almost to burn the hand applied to them. 



9. Animals become more warm by motion and exercise, wine 

 and feasting, venery, burning fevers, and grief 



10. In the paroxysm of intermittent fevers the patients are at 

 first seized with cold and shivering, but soon afterwards become 

 more heated than at first, — in burning and pestilential fevers 

 they are hot from the beginning. 



11. Let further inquiry be made into the comparative heat of 

 different animals, as fishes, quadrupeds, serpents, birds, and also 

 of the different species, as the lion, the kite, or man ; for, accord- 

 ing to the vulgar opinion, fishes are the least warm internally, 

 and birds the most, particularly doves, hawks, and ostriches. 



12. Let further inquiry be made as to the comparative heat in 

 different parts and limbs of tlie same animal ; for milk, blood, 

 seed, and eggs are moderately warm, and less hot than the out- 

 ward flesh of the animal when in motion or agitated. The degree 

 of heat of the brain, stomach, heart, and the rest, has not yet 

 been equally well investigated. 



13. All animals are externally cold in winter and cold weather, 

 but are thought to be internally warmer. 



14. The heat of the heavenly bodies, even in the warmest 

 climates and seasons, never reaches such a pitch as to light or 

 burn the driest wood or straw, or even tinder without the aid of 

 burning-glasses. It can, however, raise vapour from moist sub- 

 stances. 



15. Astronomers tell us that some stars are hotter than others. 



•» This was the ancient opinion, but the moderns incline to the 

 Wlief that these insects are produced by generation or fecundity from 

 seeds deposited by their tribes in bodi«;s ou thp veige of putief.'ctioa. 



