178 NOVrM ORGANUM. 



30. Flamma non cMiiic.it aut gcncratur, nisi cletur ali- 

 (|iiid concavi, in quo flamina movcre possit et lu- 

 dere : pnvterquam in flammis flatuosis pulveria 

 tonncntarii, et similibus, ubi compressio et inear- 

 coratio flamnue auget ejus furorem 1 . 



31. Incus per inalleuni calcfit admodum ; adeo ut si 

 incus I ucrit lamina* tenuioris, existimcmus illam 

 per fortes et continnos ictus mallei posse rube- 

 score, nt ferrum ignitum ; sed &amp;lt;le hoc fiat experi- 



mentnm 2 . 



32. At in iifiiitis, qua* sunt porosa, ita ut detur spatium 

 ad I xem iiduin motuni ignis, si cohibeatur bujus- 

 modi inotus per compressionem iortem, statim ex- 

 stinguitur ignis: veluti cum linteum ustuin, ant 

 filuiu ardcns randelar aut lanij.adis. aut etiam carbo 

 nut pnma ardens, comprimitur per ]&amp;gt;ressorium, aut 

 pcdis c(nculcati&amp;lt;&amp;gt;ncni, aut Imjusmodi, statim ces- 

 sant operationes ignis. 



33. Approximate ad coitus calidum auget calorcm, 

 pro gradu approximations ; (juod etiam fit in lu- 

 mine : nam quo propius collocatur objectum ad 

 lumen, eo magis est visibile 3 . 



JU. Vnio calorum divcrsorum auget calorem, nisi facta 

 sit commistio corponmi. Nam focus magnus, ct 



i Commmi llamc mniircs Oxy- schel s Discourse, 34?- 



,ren and then-fore requires room, &quot;The Laws of the Radiation of 



i.e. air The case of Gunpowder Heat have been found to present 



is not the same, as there the explo- strong analogies with those of Light 



sion arises from other causes : the in some points, and singular differ- 



&quot; incarceratio &quot; only gives direction ences in others.&quot; They have been 



to the explosive power. The actual investigated by M. Prevost, and by 



expansion would be just the same M. M. Dulong and Pent As we 



in ihe open air. approach the radiating body (whe- 



2 &quot; Condensation, whether of air ther it he luminous or hot), we per 



hv pressure, or of metals by jiercus- reive a greater intensity of Light or 



sion is a powerful source of Heat. Heat, and vice versa, bee Her- 



Thu s, iron may be so dexterously sohel s Discourse, 351. 

 hammered as to be red-hot.&quot; Her- 



