380 Relation of " Transfer-resistance " to Electrolytes. [May 20, 



Other measurements have been made, and which give results also 

 in accordance with the theory. 



It may be well to remark that in order to get a proper fineness of 

 particle in suspension in the water, a very convenient plan is to add 

 the varnish very gently and by very small quantities in a glass jar in 

 which the water is automatically or otherwise stirred. The water 

 should be of large volume to get the best results. To make th& 

 fineness still more uniform we have prepared the turbid medium as 

 above, and then rotated the glass flask in which it was placed at the 

 rate of about 2500 revolutions per minute. By this means any 

 particles, except the very finest, are deposited on the sides of the flask, 

 and the filtered liquid — if we may so call it — can be poured off ready 

 for any experiments. 



May 20, 1886. 



Professor STOKES, D.C.L., President, in the Chair. 



The presents received were laid on the table, and thanks ordered 

 for them. 



The following Papers were read : — 



I. " Relation of 4 Transfer-resistance ' to the Molecular Weight 

 and Chemical Composition of Electrolytes." By G. GoKE, 

 LLD., F.R.S. Received May 5, 1886. 



(Abstract.) 



In the full paper the author first describes the method he employed 

 for measuring the " resistance," and then gives the numerical results 

 of the measurements in the form of a series of tables. 



He took a number of groups of chemically related acids and salts 

 of considerable degrees of purity, all of them in the proportions of 

 their equivalent weights, and dissolved in equal and sufficient quanti- 

 ties of water to form quite dilute solutions. The number of solutions 

 was about seventy, and included those of hydriodic, bydrobromic, 

 hydrochloric, hydrofluoric, nitric, and sulphuric acids ; the iodides, 

 bromides, chlorides, fluorides, hydrates, carbonates, nitrates, and 

 sulphates of ammonium, csesium, rubidium, potassium, sodium, and 

 lithium ; the chlorides, hydrates, and nitrates of barium, strontium, 

 and calcium ; and a series of stronger solutions, of equivalent 

 strength to each other, of the chlorides of hydrogen, ammonium, 



