Prof. Graham on the Diffusion of Liquids, 265 



tures ; one, the temperature of the atmosphere, which was 

 fortunately remarkably constant during most of the experi- 

 ments to be recorded at present, and the other, a lower tem- 

 perature, obtained in a close box of large dimensions, con- 

 taining masses of ice. The results at the artificial temperature 

 were obviously less accurate than those of the natural tempe- 

 rature, but have still considerable value. Three experiments 

 were generally made upon the diffusion of each solution at the 

 higher, with two experiments at the lower temperature. 



(1.) The carbonate and sulphate of potash and sulphate of 

 ammonia were first diffused during a period of seven days, of 

 which the temperatures observed by a thermometer placed 

 near the water-jars were 64<°-5, 65°, 63°*5, 63°, 63°, 63°*5, 65° 

 and 66°; mean temperature 64°*2. 



Table VII. — Diffusion of Carbonate of Potash, Sulphate of 

 Potash and Sulphate of Ammonia. 







At 64°'2. 



At 37 0, 6. 



Parts of anhydrous salt to 100 water. 



Density of 

 solution at 



















60°. 



Experi- 

 ments. 



Mean. 



Experi- 

 ments. 



Mean. 



Carbonate of potash. 













2 



10178 



5-36 





3-80 









5-55 



5-45 



3-91 



3-85 



4 



1-0347 



10-39 





6-99 









1011 



10-25 



719 



7-09 



<5f 



10572 



16-50 





11-42 









16-46 





11-08 



11-25 







17-05 



16-67 







10 



1-0824 



24-42 

 24-94 

 24-70 



24-69 







Sulphate of potash. 













2 



10155 



5-62 





3-93 









5-42 



5-52 



3-98 



3-95 



4 



1-0318 



10-49 





7-50 









10-65 



10-57 



731 



7-40 



6| 



10512 



1707 





1162 









16-89 





11-71 



11-66 







1754 



1717 







10 



10742 



23-40 

 23-59 













23-88 23-62 







Sulphate of ammonia, NH 4 0, SO 5 . 













2 



10117 



5-71 





3-73 









5-45 



5-58 



3-79 



3-76 



4 



10229 



10-72 





7-54 









10-30 



1051 



7-86 



7-70 



H 



10369 



17-28 





10 94 









16-28 





1098 



10-96 







16-80 1 16-79 







10 



10529 



21-86 

 22-49 













22-25 



22-20 







