Invaporation. 



4*71 



In Experiment 2 of this series the proportion of water is 

 doubled. 



Series A., Experiment 21. 





..0.5836 

 ..0.7441 



ft 



"cl 



>> 



c3 

 ft 





ft 



3 



1 



ft 



u 



CD 



Is 



1 

 ft 





Sodium Chloride.. 

 Potassium " 



111 



0.9516 

 0.4866 



155 



1.1160 

 0.3166 



276 



1.3331 

 0-0991 



2901.3386 

 i 0.0976 



431 



1.3523 



0.0841 



The potassium chloride still holds an appreciable quantity 

 of water, and in all probability will continue to do so. 

 Experiment 3, in which the proportion of water is again 

 doubled, is still in progress. After 286 days the water is 

 divided in the ratio of about 5 to 1. In Experiment 4, after 

 404 days, the salts have divided the water (again doubled) 

 into approximately equal parts. We are watching this and 

 Experiment 5 with considerable interest, and we expect 

 that the latter will show a reversal in the invaporating 

 power of the saline solutions, since very dilute sodium 

 chloride solutions may have less invaporating power than 

 corresponding potassium chloride solutions. 



During the past year, we tried a series of invaporation 

 experiments with the so-called "gem" and "crown" 

 jars, hoping that they would be found to be air-tight. Two 

 interesting results followed from experiments with these 

 jars. They were carefully selected from a large stock, but 

 only a small percentage of those selected were found to be 

 air-tight. Of course the slightest leakage alters the con- 

 ditions of the experiment. In the second place, it was found 

 that the large space enclosed by these jars (large as com- 

 pared with that enclosed by the narrow tubes and bottles 

 before used) made invaporation exceedingly slow. 



Series B is for the purpose of showing the effect of in- 

 creasing the ratio of sodium chloride. The effect, as seen 

 by comparing Experiment 1 with Experiment 2 of Series A, 

 is twofold, (1) to increase slightly the rate of invaporation 

 by the sodium chloride, and (2) to dry the potassium 

 chloride more completely. 



