466 



CATALOGUE. — METEOROLOOr, EVAPORATION. 



Dalton's elucidations of his theory of mixed 

 gases. Nich. 8. III. 267. Ph. M. XIV. ' 

 169. Gilb. Xni. 438. Nich.Vrn. 145. 



.Dalton's answer to Gough. Nicii. IX. 89, 

 2S9. 



Biot on Dalton's theory. B. See. Phil. n. 72. 



Quotes Laplace as ha-ving compared Dalton's theory with 

 Saussure's experiments ; btjt Dalton had done the same. 

 The comparison is however still imperfect. 



Parrot's theory. Gilb. X. ii. XIII. 244. 



- Professor Parrot considers the moisture contained in air as 

 existing in two distinct states, of chemical and of physical 

 vapour: he thinks the chemical vapour is sustained merely 

 by the oxygen gas contained in the air, and that it is preci- 

 pitated in consequence of the diminution of the oxygen ; and 

 the physical vapour he supposes to be merely interposed be- 

 tween the interstices of the elastic particles of air, and re- 

 .tiined-in its situation by heat : that the chemical solution 

 of water orice resembles oxidation, but that no physical eva- 

 poration can take place under the freezing point. Mr. Par- 

 rot builds his theory principally on eudiometrical experi- 

 ments with phosphorus, which are attended with a copious 

 precipitation, while the absorption of oxygen seems also to 

 be much accelerated by the presence of water ; but these 

 experiments do not appear to be, by any means, decisive in 

 favour of Mr. Parrot's theory. The same paper contains a 

 proposal for inoculating the clouds with thunder and light- 

 ning, by projecting a bomb to a sufficient height. 



Parrot's remarks on Dalton. Gilb. XVII. 82* 

 Wrede's remarks on Parrot. Gilb. X. 488. 



XII. 319. 



Bockmann's remarks on Parrot. Gilb. XI- 



66. 

 Mitchill on vapour from cold. Gilb. XI. 474. 

 Sea water smokes when 25» warniet th«n the air: rain 

 water when j 9°. 



Desormes on the water contained in gases. 

 Gilb. XIII. 141. 



Finds the quantity independent of the nature of the gas, 

 agreeing with Deluc, Volta, and Dalton. 



Henry. Ph. tr. 1803. 29. 2~4. 



Fmds, that equal volumes of the same gas, under differ- 

 ent pressures, are absorbed by water. See Springs. 



Henry on Dalton's theory of gases. Nich. 



Vlll. 297. IX. 126. 

 Remarks on Dalton. Berthollet's chemical 



statics. I. 346. 

 Haiiy Traite de physique. 



Adopts Dalton's calculations, but reduces his theory to 

 the ideas which were originally Deluc's. 



Accum's apparatus for drying. Nich.VI.212. 



Gough on the solution of water in the at- 

 mosphere. Nich. VIII. 243. 



Gough on Dalton's theory. Nich. IX. 52 

 107, 160. " ' 



The few experiments, adduced as objections to Dalton'* 

 theory, agree, in fact, very accurately with it. 



Remarks on the Quantity of Moisture contained in Air. 



If we examined the progression of M. Saussure's resultt 

 alone, we might conclude, that the presence rfair increases 

 the capacity of any space for vapour, nearly in the subdu- 

 plicate rario of the density, and that air of the usual density 

 enables it to contain five times as much vapour as could re- 

 main in it when free from air. But it agrees almost as well 

 with these experiments, and much better with those of 

 Schtnidt, to suppose that the presence of air increases the 

 capacity of a space for moisture in the simple ratio of its den- 

 sity, enabling it to contain, under the common pressure, 

 about twice as much as it could contain in its total absence. 

 These experiments ought to be repeated, but until they 

 are confirmed, they scarcely authorise us to reject the ppl- 

 nion of Deluc. 



