1864.] 



Prof. Guthrie on Drops. 



U7 



liquid will always be of the same size, if it is formed of the same liquid 

 substance and falls from a solid of the same substance, size, and shape, 

 provided that the temperature remain the same, and the growth-time be 

 constant. 



The size of the drops may be most conveniently determined by weighing 

 a noted number of them. We are concerned rather with the relative than 

 with the absolute sizes of the drops. The sizes of drops formed of the 

 same liquid are proportional to their weights ; of different liquids, to those 

 weights divided by the specific gravities of the liquids. 



In the first series of experiments the apparatus, fig. 1, was employed. 

 The globe A, full of the liquid under experiment, is inverted into tlie 

 cylinder B, containing the same. The mouth of A is supported just in 



contact with the surface of the hquid in B, by means of the tripod stand 

 D. A and B are carried on a table, which may be raised or lowered at 

 pleasure. A siphon, E, leads from the reservoir B, and is firmly held by 

 the clamp F. The longer limb of E, from which the liquid flows, is 



