44 THEOR T of RAIN. 



air, of the different temperatures, indicated by the points of the 

 line C H, from which they are drawn. 



LET us now confider thefe three rates of aqueous folution, 

 with a view to know the effec~l of mixing together faturated 

 portions of the atmofphere of different temperatures. For this 

 purpofe, let it be obferved, that the ordinates to the line m r t 

 drawn from the point of C H, which denotes the temperature 

 of the mixture, will always reprefent the quantity of water con- 

 tained (whether diffolved or not) in an unit of the mixture ; 

 for the ordinates m a, r , were taken in the proportion of the 

 quantities contained in an unit of air of the temperatures a and 

 b ; and it is to be prefumed, that, upon mixture, the heat, and 

 alfo the water, are uniformly diffolved ; and, therefore, both 

 the heat and water, contained in an unit of the mixture, vary in 

 the fame proportion, and may be expreffed by the fame meafure. 



IN the iuppofition of equable folution, let us mix equal por- 

 tions of faturated air, of the temperatures 10. and 40. the 

 mixture will produce a temperature 25. which will be reprefent- 

 ed by the ordinate o p. This ordinate alfo reprefents the qxian- 

 tity of water contained in an unit of the mixture. But it alfo 

 reprefents (in the prefent fuppofition) the quantity of water, 

 held in folution by an unit of air of the temperature 25. 



INSTEAD of equal portions, let two parts of a faturated fohi- 

 tion, of the temperature 40. be mixed with one part of a fatu- 

 rated folution, of the temperature 10. the temperature pro- 

 duced will be 30. and will be expreffed by u q ; which will alfo 

 exprefs both the water contained in an unit of the mixtxire, and 

 the quantity of water held in folution by the unit. 



IN like manner, two parts of the temperature 10. mixed with 

 one part of the temperature 40. produces a mean temperature 

 20. ; and the ordinate c n expreffes the heat, mixture, and folu- 

 tion of the unit. 



EVERY mixture, therefore, that can be made of this folution 

 will be found equally faturated, as are its conftituent parts, and 



will 



