Dr. Hare and Prof. Daniell on the Electrolysis of Salts. 461 
large vacuities must have been left in others. Had such con- 
vulsions ever taken place, traces of them must have been con- 
spicuous; but, in fact, nothing of the kind has been de- 
tected, even in a single instance. 
If, however, the movements be supposed to have taken place 
before the rocks had become perfectly solid, in fact, whilst 
they were in a state which permitted segregatory or molecular 
action, the question will no longer be one of simple mechani- 
cal displacement, but rather concern those forces which deter- 
mine the movements of minute particles of matter. 
Whether any actions thus arising could have given birth to 
the diversified phenomena we have considered seems to have 
no practical bearing, and therefore forms no part of this in- 
uiry. 
4 Clarence-street, Penzance, 1842, Sept. 29th. 
LXXVIII. Some Observations on the Electrolysis of Salts. By 
Rosert Hare, M.D., Prof: of Chem. Univ. of Pennsyl- 
vania: with a Reply thereto by J. Freperic Danix11, Lor. 
Sec. R.S., Prof. of Chem. King’s College, London; in a Letter 
addressed to R. Phillips, Esqg., F.R.S., Se. 
My pear Sir, 
Y friend Dr. Hare has done me the favour to send me a 
copy of a paper which he has recently published, en- 
titled “« An Effort to refute the arguments advanced in favour 
of the existence, in the Amphide Salts, of Radicals consisting, 
like cyanogen, of more than one element.” Amongst these 
arguments, with the majority of which I am not disposed at 
present to interfere, he ranks the deductions which I have 
drawn from my electrolytic experiments. ‘To observations 
made by such high authority I am desirous of making some 
reply, and as the subject is of considerable importance, I am 
induced to think that you will endeavour to make room in the 
Philosophical Magazine both for so much of the paper as 
concerns the electrolysis, and the few brief remarks upon it 
which I wish to make. 
Dr. Hare observes,— 
« 66. The last argument in favour of the existence of salt radi- 
cals, which I have to answer, is that founded on certain results of 
the electrolysis of saline solutions. 
«“ 67. On subjecting a solution of sulphate of soda to electrolysis, 
so as to be exposed to the current employed, simultaneously with 
some water in a voltameter, Daniell alleges that, for each equivalent 
of the gaseous elements of water evolved in the voltameter, there 
was evolved at the cathode and anode, not only a like quantity of 
those elements, but likewise an equal number of equivalents of soda 
