100 NOVUM ORGANUM. 



13. All shaggy substances, as wool, the skins of animals, 

 and the plumage of birds, contain some heat. 



14. All bodies, both solid and liquid, dense and rare (as 

 the air itself), placed near fire for any time. 



15. Sparks arising from the violent percussion of flint 

 and steel. 



16. All bodies rubbed violently, as stone, wood, cloth, 

 &c. so that rudders, and axles of wheels, sometimes catch 

 fire, and the West Indians obtain fire by attrition. 



17. Green and moist vegetable matter confined and rub 

 bed together ; as roses, peas in baskets ; so hay if it be 

 damp when stacked often catches fire. 



18. Quick lime sprinkled with water. 



19. Iron, when first dissolved by acids in a glass, and 

 without any application to fire ; the same of tin, but not so 

 intensely. 



20. Animals, particularly internally ; although the heat 

 is not perceivable by the touch in insects, on account of 

 their small size. 



21. Horse dung, and the like excrement from other 

 animals, when fresh. 



22. Strong oil of sulphur and of vitriol exhibit the ope 

 ration of heat in burning linen. 



23. As does the oil of marjoram, and like substances, in 

 burning the bony substance of the teeth. 



24. Strong and well rectified spirits of wine exhibit the 

 same effects ; so that white of eggs when thrown into it 

 grows hard and white, almost in the same manner as when 

 boiled, and bread becomes burnt and brown as if toasted. 



25. Aromatic substances and warm plants as the dra- 

 cunculus [arum], old nasturtium, &c. ; which though they 

 be not warm to the touch (whether whole or pulverized), 

 yet are discovered by the tongue and palate to be warm 

 and almost burning when slightly masticated. 



26. Strong vinegar and all acids, on any part of the body 

 not clothed with the epidermis, as the eye, tongue, or any 

 wounded part, or where the skin is removed, excite a pain 

 differing but little from that produced by heat. 



27. Even a severe and intense cold produces a sensation 

 of burning.* 



&quot; Nam Boreas penetrabile frigus adurit.&quot; 



* &quot; Ne tenues pluviae, rapidive potentia solis 

 Acrior, aut Boreas penetrabile frigus adurat.&quot; 



Virg. Georg. I. v. 92, 93. 



