454 



Prof. Guthrie on Drops. 



[Recess, 



that the successive strengths of the saUne solutions, whether there be loss 



of volume owing to chemical union or not, are as |» |> 0* 



These numbers give exactly the relative quantity of solid matter in a 

 unit of volume of tlie liquid. As, however, solution 1 on dilution evolves 

 heat and therefore probably contracts, the sizes of the drops cannot be 

 derived directly from their weights. The specific gravity of each solution 

 has to be determined experimentally. 



Table V. — Solutions of Ca CI. 



Radius of ivory sphere=22'l millims. 



T=28° C. 



ouiuiiun 



of Ca CI. 



of single drop *. 



Specific 

 gravity. 



Relative size 

 of single drop. 



Water or 



grra. 







S 



oo 



018516b- 



1-0000 



0-18517 



s 



128 



0168137 



1-0039 



0-16750 



S 



Gi 



0-172907 



1 0084 



0-17147 



S 



32 



172593 



10172 



016967 



S 

 16 



1 67222 



1-0383 



016105 



S 

 8 



0191008 



1-0720 



0-17817 



S 

 4 



195839 



11721 



0-16742 



S 



0-211396 



1-2786 



0-16533 



2 









S 



0-225558 



1-4939 



0-15098 



The column of the relative sizes of the single drops (which is got by 

 dividing the mean weights by the corresponding specific gravities) shows 

 that, under like conditions, a drop of water is larger than a drop of solution 

 of chloride of calcium of any strength whatever. The comparatively small 



quantity of solid matter in causes the drop to diminish about ^th of its 

 128 



volume. 



We must bear in mind that the successive increments of solid matter 

 may affect the size of the drop in opposite directions, — by affecting the 



* The first number from six, the following numbers from four determinations of the 

 weight of 30 drops. 



