238 ftOVUM ORGANUM. 



20. Animalia, prassertim et perpetuo per interiora ; licet in 

 insectis calor ob parvitatem corporis non deprehendatur ad 

 tactum. 



21. Fimus equinus, et hujusmodi excrementa animalium re- 

 centia. ^ /.^ t .^ ^^A- 



22. Oleum forte sulphuris et vitrioli exequiturjjpera caloris, 



in linteo adurendo. 



oo rn * * ^*" C^ 4. i, j- *j. i 



23. Oleum origam, et hujusmodi, exequitur opera caloris, in 



adurendis ossibus dentium. 



24. Spiritus vini fortis et bene rectificatus exequitur opera 

 caloris ; adeo ut, si albumen ovi in eum injiciatur, concrescat et 

 albescat, fere in modum albuminis cocti ; et panis injectus tor- 

 refiat et incrustetur, ad modum panis tosti. 1 



25. Aromata et herbae calidae, ut dracunculus, nasturtium 

 vetus, etc. licet ad manum non sint calida (nee integra, nee 

 pulveres eorum), tamen ad linguam et palatum parum masticata 

 percipiuntur cajida, et quasi adurentia. 



26. Acetuin forte, et omnia acida, in membro ubi non sit 

 epidermis, ut in oculo, lingua, aut aliqua alia parte vulnerata, et 

 cute detecta, dolorem cient, non multum discrepantem ab eo 

 qui inducitur a calido. 



27. Etiam frigora acria et intensa inducunt sensum quendam 

 ustionis ; 



" ISTec Boreas penetrabile frigus adurit." 2 



28. Alia. 



Hanc Tabulam Essentice et PrcBsenticB appellare consuevimus. 



XII. 



Secundo, facienda est comparentia ad Intellectum Instantia- 

 rum quae natura data privantur : quia Forma (ut dictum est) 



1 The analogy which Bacon here remarks, arises probably, in the second instance, 

 from the desiccative power due to the strong affinity of alcohol for water. The French 

 chemist Lassaigne found, I believe, that alcohol extracted a red colouring matter from 

 unboiled lobster shells ; but I am not aware that the modus operandi has in this case 

 been explained. But by far the most remarkable case of what may be called simulated 

 heat, is furnished by the action of carbonic acid gas on the skin. Of late years baths 

 of this gas have been used medicinally ; but M. Boussingault long since remarked the 

 sensation of heat which it produces. He states that at Quindiu in New Granada there 

 are sulphur works, and that at various points nearly pure carbonic acid gas escapes 

 from shallow excavations in the surface, containing, however, a trace of hydro-sulphuric 

 acid ; that the temperature of this issuing stream of gas is lower than the external air, 

 but that the sensation is the same as that produced by a hot-air bath of perhaps from 

 40 to 45 or 48 centigrade (104 to 11 6 Fahr.). As this effect has not been noticed 

 in carbonic acid gas prepared artificially, it is probable that it requires for its produc- 

 tion the gas to be in motion ; so that the necessary conditions are not present when the 

 hand is inserted into a jar of the gas. 



2 Virg. Georg. I. 93. 



