fuhjijling In the Atmofpbere. 347 



Kofe. — 1°. Moft of the interpolations from the 88lh de- 

 gree to the I22ncl I have myfelf inferted, as thofe calculated 

 by Schmidt erred too widely by his own account. — Gren's 

 Phyf, Jour. iv. 273. 



ado. Mr. Piclet has alfo made a fet of curious experiments 

 on the elafticlty of pure vapour in low temperatures. EjJ^its 

 de Fhyjique, p. 157. He found that a grain of warm water 

 m vacuo evaporates in forty minutes in the temperature of 

 ^^cS' Fahr. under a receiver containing 1452 Englirti cubic 

 inches', but that it did not diffufe itfelf equally in lefs than fix 

 hours, and then raifed the hygrometer from 17* to 60°, that 

 IS 43"^; and during this whole time the cold under the re- 

 ceiver was conrtantly decreafing, though (lowly ; which de- 

 creafe undoubtedly contributed to the difFufion of the va- 

 pour, 



Mr. Schmidt has alfo made a feries of experiments upon 

 the dilatability of air, made as dry as poffiblc by expofure to 

 hot tartarin — an objcft of great importance, that had never 

 before been examined. This table I here infert, converting 

 Keaumur's degrees into thofe of Fahr. and adding from his 

 formula the degrees he omitted. 



Ibid, page 91. 

 K2 



A"©/*, 



