1864.] 



Prof. Guthrie on Drops, 



483 



the solids examined, antimony delivers the smallest, and tin the largest 

 drops. 



Laio 6.— The drop-size depends upon temperature ; generally, the higher 

 the temperature the smaller the drop. "With water, the effect of a change 

 of temperature of 20° C. about 30° C. is very small. 



Law 7. — The nature or tension of the gaseous medium has little or no 

 effect upon drop-size. 



SLL. 



Law 8. — The drop-size of a liquid which drops under like conditions 

 through various media, does not depend wholly upon the density of the 

 medium and consequent variation in the weight, in the medium, of the 

 dropping liquid. 



Law 9. — If there be two liquids, A and B, which drop under like con- 

 ditions through air, and the drop -size of the one, A, be greater than the 

 drop- size of the other, B, then if a third liquid, C, be made to drop through 

 A and through B, the drop-size of C through A is greater than the drop- 

 size of C through B. 



Law 10. — If the drop-size of A through B be greater than the drop- 

 size of A through C, then the drop-size of a fourth liquid, D, through B is 

 also greater than the drop-size of D through C. 



Law 1 1 . — If a liquid. A, drop under like conditions in succession through 

 two liquids, B and C, then its drop -size through any mixture of B and C 

 is intermediate between its drop-size through B and its drop- size through 



T> 



C. Corr. And the greater the proportion of q in the mixture the more 



nearly does the drop-size of A through the mixture approach to the drop- 



size of A through ^ alone. 



Law 12. — The drop-size of any mixture of two liquids, A and B, drop- 

 ping through a third liquid, C, is intermediate between the drop-size of A 



A 



through C and that of B through C ; and the greater the proportion of -g 



in the mixture, the more nearly does the drop-size of the mixture approach 

 A 



to the drop-size of -g alone, whether the dropping liquid be heavier or 



lighter than the liquid medium. 



Law 13. — If the liquid X has a larger drop-size than the liquid Y in 

 the liquid Z, then the liquid Z has a larger drop-size in X than it has in Y. 



Law 14. — If a liquid, X, has a larger drop -size than a liquid, Y, in air, 

 then the drop -size of X through Y is larger than the drop-size of Y 

 through X. 



Law 15. — If the drop -size of X be greater than the drop-size of Y in 

 air, and the drop-size of Y be greater than the drop-size of Z in air, then 

 the ratio between the drop-sizes of X in any mixture of Y and Z, and the 

 drop-size of that mixture of Y and Z through X, is greatest when the ratio 

 between Y and Z is unity. 



