130 On a change of Clunate. 
relation to the quantity of the fluid, were quite as large in size. They 
remained thirty-six hours in an atmosphere, whose temperature was 
increasing from 46° to 58° Fah.; some fluid oil then collected in 
globules, and the exact temperature of a half fluid mass was 514° F. 
Roxbury Laboratory, 5th March, 1831. 
Art. XV.—On a change of Climate.* 
(FROM THE WRITINGS OF THE LATE BISHOP HEBER.) 
“Tux principal apprehension at present [in Norway] arises from 
the too rapid destruction of their forests, to the existence of which 
they attribute, with apparent reason, the superior mildness of their 
climate to countries under the same latitude.” —Life of Bishop He- 
ber, Vol. I. p. 80. 
“ The.resemblance of the Tanais to the Nile has been remarked 
by many writers ; but that these ample downs, whither its a 
waters cannot extend, have not since degenerated into a desert, 
those of the Thebais, must be ascribed to the difference of ne 
and the beneficial effects of a four months continued snow. 
“This rigor of climate is so greatly at variance with those inter- 
ested reports which, in the hope of attracting settlers to her new do- 
minion, were circulated by the empress Catharine ; and it differs 80 
widely from that temperature which might be supposed to exist in 
the latitude of forty-six, in the same parallel with Lyons and Gene- 
va,—that though the ancients observed and recorded it, the fact has 
been very slowly admitted by the generality of modern inquirers: 
Even among those who yielded a respectful attention to the authority 
* Extract of a letter from David Thomas, ~~ to Prof. J. Griscom, dated, 
“ GREATFIELD, 12th Mo. 10, 1880. 
‘Since my last letter was written, I have read with much interest and satisfac- 
ion, some remarks of the late Bishop Heber on physical climate, which differ be 
point of fact from several writers on this subject. His opinion will command the 
greatest deference, not only on account of his eminent talents, but because he W4 
_on the spot to observe and to inquire. I copy such parts as appear pertinent to our 
» f 
nrac, + 
** As much has been written on a change of climate, and, in my view, many er 
roneous notions widely diffused, perhaps it would subserve the interests of scien? 
to offer Heber’s remarks for a place in Prof. Silliman’s Journal.” 
