Tttquir^ irito tie Laivs of JffinU^, j^jj 



tiie valves r?fume their firft ftate, and the pifton muft again rife, &c. &c.. The ptimp H is 

 kept conftantly at work by the motion of the engine, and carries off the water of the in- 

 jeftion heated by the fteam, and alfo the permanently elaftic fluid, which may be extricated 

 from the water : and of this hot water it is that the boiler in fteam engines is ufually re- 

 pleniflied. Inftead however of this direft fupply in the prefent engine, the hot water is 

 fuffered to flow into the fmaller refervoir G, G, G, which it keeps conftantly full and 

 overflowing, and from which a portion is.raifed by the fmall pump E through the pipe 

 F, M, F, F, tranfmitted through the paflage to the condenfer, and confequently having its 

 exterior furface in conta£l: with the hot fteam as it ruflies towards the condenfer, and by 

 that means having its contents, and ccnfequently thofe of the veflel G G G, greatly heated , 

 by the circulation efFefled by the pump. The boiler is fupplied by the pipe N, placed fo 

 far below the return M, that the preflure of the column I M may exceed the re-a(Slion of 

 the fteam in the boiler, which might otherwife prevent its introduction. 



I am not prepared to fay to what extent this improvement may add to the power of the 

 engine. 



VI. 



Inquiries relative to the Laivs-of Jffinity, By CiT. BertholLIT. * 

 (^Continued from page io8.) 

 On the Itijfuence of the Proportions in Complex j^Jintties, 



iL 



LN my former inquiries I have afcertairied the principal refults afforded by complex 

 affinity, when the force of cohefion, or that of elafticity are fufftci^tly great to produce 

 that chartge of bafe which had been attributed to the fuperiority of the divellent affinities 

 over the quiefccnt affinities. But I have negleded to enter into the neceflary details for 

 determining the changes which may arife from different proportions of the fubftances 

 which are brought into a£llon, when the foirce of cohefion is not fufficiently great to caufe 

 the effe£ls of this difference to difappear. I have promifed (in Art. XII. No. 6,) to return 

 to this fubjefl, which I ftiall now pi-oceed to do. . 



According to the theory which I have laid down (Art. V. No. 5), all fubftances exert a 

 mutual a£lion during the time they are in the liquid ftate; fo that in a folution, for exam- . 

 pie, of fulphate of pot-afti and muriate of foda, thefe'two falts are not diftinft, while there 

 is no caufe to determine the feparation from their co'mbTnation ; but that there exifts iii 

 this liquid, fulphuric acid, muriatic acid, foda, and pot-affi. Ifliall, however, continue to 

 make ufe of the ordinary language, which after tWs notice, ought not to. produce any 

 ambiguity. 



• Annales de Chimie, XXXVIII. 3, 



2. I 



