28 Miscellaneous Notices on Galvanic Results. 
to diminish their humidity will also diminish their conducting 
_ power, and with it their susceptibility. * * * The destruc- 
tive effects of frost upon the succulent parts of plants, or upon 
their tissue when in a succulent condition, may thus be accounted 
for independently of the mechanical expansion of their parts; 
indeed, it is chiefly to that circumstance that Dr. Neuffer ascribes 
the evil influence of cold in the spring; for he found, that at 
Tubingen nearly all trees contain eight per cent. more of aqueous 
parts in March than at the end of January; and the experience 
of the past winter shows that the cultivation of plants in situa- 
tions too much sheltered, where they are liable to be stimulated 
into growth, and consequently to be filled with fluid, by the 
warmth and brightness of a mild, protracted autumn, exposes 
them to the same bad consequences as growing them in damp 
places, or where their wood is not ripened, that is to say, ex- 
hausted of superfluous moisture, and strengthened by the deposi- 
tion of solid matter, resulting from such exhaustion.” 
Arr. IIL— Miscellaneous Notices* on Galvanic results, in letters 
addressed to Prof. Silliman, October 4, 1838, and August, 
6, 1839, from the vicinity of London ; = Wanttam STURGEON, 
a 
REMARKS BY THE EDITORS, 
Tue invention of the constant battery by Prof. Daniel of the 
Royal Institution, and its modifications and improvement by suc- 
cessive investigators, are more or Jess known to the —— pub- 
lic. 
A very economical and efficient arrangement of this nature was 
adopted by several members of the London Electrical Society, 
and a report of the construction and performance of the battery, 
in a series of experiments performed at Clapham Common in the 
autumn of 1838, is contained in the report of Mr. Charles V. 
Walker, published in the Transactions of the London Electri- 
cal Society, in two papers dated October 16, and November 6, 
1838. In allusion to this battery, Mr. Sturgeon observes, in his 
letter of a 9, 1838 :— 
eo eee 
sae 
se tae 
“Their earlier appearance has been accidentally prevented, 
