17(i NOVUM ORGANUM. 



qua 1 sunt sine magna acrimonia. Fortissimus autem 

 calor reperitur in pice et rcsina, atque adhuc magis 

 in siil])liure, et caplmra, et naphtha, et petroleo, et 

 salibus, (postquam niateria eruda eruperit) et in 

 horuni conipositionibus, veluti pulvere tormcntario, 

 igno Gra?eo !i: , (quern vnlgo ignein terum vocaut) 

 rt diversis ejns geiieribus, qua* tain obstinatum lia- 

 bcnt calorein, ut ab aquis non facile exstinguaiitur. 



22. Kxistinuunus etiain tlannnani, qua* rcsultat ex 11011- 

 nnllis nu-tallis imperfectis 1 &quot; 1 , esse valde robustam 

 et aercni. Veruin de istis omnibus inquiratur 

 ulterius. 



23. Videtur autcni flainma fulininnin potentiorum 92 

 lias oTiincs flaminas suj)erare ; adco ut ferruni ip- 

 suiu ])erfectinn ali&amp;lt;juando colli&amp;lt;|iiaverit in guttas ; 

 quod flainiiuo illtv altcnv iacere non ]&amp;gt;ossuut. 



S&amp;gt;4. Tn ignitis autem diversi sunt etiain gradus caloris, 

 de (juibus etiain non fac-ta est diligens inqnisitio. 

 Calorein inaxiine debilem existiinanius esse ex lin- 

 teo nsto ; quali ad ilamnur excitationem uti solo- 

 inns ; et similiter ex ligno illo s])ongioso, aut fnni- 

 culis arefactis, qui ad tonnentorum accensionem 

 adhibentur. Post liunc sequitur carbo ignitus ex 

 lignis, et anthracibus, at&amp;lt;jin; etiain ex lateribns ig 

 nitis, et similibus. Ignitoruin autem veliemcntis- 

 sime calida existimamus esse metalla ignita, ut 



Gunpowder The ordinary metallic substances which are ductile 



composition of Gunpowder is i ni- and fixed in the fire, to a certain 



tre sulphur, | charcoal. See &amp;lt;leyree, but which are destroyed by 



infr. II. 36. Inst. 7. the continued action of fire; i. e 



Greek-fire was said to be com- changed into an earth deprived of 



posed of sulphur, naphtha, pitch, all the characteristic properties o 



gum, and bitumen ; it burnt under metals viz. copper, iron, tin, a 



water It was invented by a Greek lead. 



engineer of Heliopolis in Syria, * &quot; potentiorurn as opposed to 



named Callinicus, A. D. 660. Sheet lightning. Cf. supra, II. 12. 



- &quot; Imperfect Metals,&quot; sc. those Inst. 9. 



