in Mercury by Deoxidation, 491 



Measured diameter of drop. 



At rest. Contracted 



d. cT. 



d 



d'' 



3*35 centims. 34 centinis. 1-08 



3-4 „ 3-0 „ 1-13 



3-45 „ 3-2 „ 1-08 



3-55 „ 3-35 „ 1-06 



2-9 „ 2-7 „ 1-07 



3-7 „ 3-45 „ 1-07 



4-0 „ 3-6 „ 1-11 



3-6 „ 3-3 „ 1-09 



3-4 „ 3-15 „ 1-08 



3-5 „ 3-25 „ 1-08 



3-85 „ 3-6 „ 1-07 



4-15 „ 3-8 , 1-09 



3-35 „ 3-1 '' 1-08 



3.75 „ 3-5 ;, 1-0? 



Mean . . 1*08 



With dilute sulphuric acid with one Smee cell. 



2*2 centims. 2*05 centims. 1*07 



2-35 „ 2-1 „ 1-12 



2-4 „ 2-1 ,, 1-14 



2-5 „ 2-3 „ 1-09 



2-3 „ 2-1 „ 1-10 



2-3 „ 2-0 „ 1-15 



2-25 v 1-95 „ 1-15 



2-1 „ 1-9 „ 1-10 



2-55 „ 2-3 „ 1-11 



2-2 ;; 2-o „ i-io 



2-4 2-25 „ 1-07 



2-25 „ 2-05 „ 1-10 



Mean . . 1*11 



The mean with acidulated water is higher than that with 

 distilled water. This may be due to the greater conductivity 

 of the acid water causing the reducing action to be more 

 complete and prompt, and partly to reduction of sulphate. 



It has been shown by Mr. Paalzow * that a drop of water 

 placed upon mercury contracts as soon as a small crystal of 

 sodium hyposulphite is dropped into it. The action is in this 

 case identical with that of the reducing current of the battery. 

 The following measurements of the diameters of water-drops 

 * Togg.Ann. vol. civ. (1858), p. 420. 



