[ 34° ] 



2Vo/f. — lo. Hence we fee that looo inches or meafures of dry air 

 at 32<' would become 1004,4675 at 34.25 Fahr. and at 50? 

 would become 1017,87. Hence 1000 meafures of dry air gain 

 1,985555 &c. by each degree of Fahr. above 32*^ (or more compen- 

 dioufly 1,9856 which, is true to two decimal places) or ncxirly two. 



2do. We icQ the fource of the difcordant refults of D'Amontoms, 

 De Luc, Lambert, Schuckburg, Roy, BerthoUet, and Monge, &c. for 

 they all operated upon air more impregnated with various degrees 

 of moiflurej befides taking the boiling point at different barom- 

 trical heights; in the prefent experiments it was taken at 29,841 

 Englifh inches. 



3io. It appears that the expanfions are as the differences of heat 

 above 32*^ as D'Amontons, Lambert and Schuckburg alfo noticed, 

 though their experiments, not being made on perfedly dry air, could 

 not be very exad. 



Thedilatation of the moifliire contained in air has beenfcparately 



examined by Mr. Schmidt, and he has flievvn how from it the 



volume of air faturated with moiflufe, faturated I fay at every degree 



of Reaumur, may bedifcovered; the refult of his experiments appear 



.in the following .table of the volume which 1000 meafures at 32' 



of 



