— ‘ i +. * ‘ ‘ oe 
‘e 7 F9 ae : « . 
; Pg es See Ec ia 8 
: - gas 
106 ‘Scientif Imtelllgert as ‘. 
‘itingilan elivsen confined within such narrow limits, and which 
now scattered over the plains and valleys. We may then, fro 
the indications already afforded, look for crystals of gigantic di- , 
-.. mensions, and possessing all their native unaltered beauty. 
Boston, May 17, 1850. 
SCIENTIFIC INTELLIGENCE. 
I. Cuemistry AND Puysics. 
1. On the Diffusion of Liquids; by Professor Grauam, F.R.S., 
(Proc. Roy. Soc., Phil. Mag., Feb., 1850, vol. xxxvi, p. 189.)—The ap- 
water was very simple. 7 consisted of an open phial to contain the . 
jar the “ water-jar,” the pair meee form a * diffasion cell.” 
diffusion was stopped, generally after seven or eight days, by Bates 
by ae to dryness. 
e characters _ fap diffusion were first examined in detail with 
ais to comm It. 
It was found, ai: that with solutions containing 1, 2, 3 and 4 per 
cent. of salt, the quantities which diffused out of the phials into the wa- 
ter of the jars, and were obtained by evaporating the latter, in a con- 
stant pone of eight GYM were as nearly in proportion to these num- 
bers, as ‘99, 3°01 and 4:00; and that in repetitions of the experi- 
. ments, os ois did n ot ary more than ;4th part. The proportion 
of salt much diffused out in such experiments amounted to about th 
of the whol 
snihy,. that the propery of salt diffused increases with the tem- 
perature ; an elevation of 80° F. doubling the quantity of chlorid of so- . 
dium diffused in the same time. 
The diffusibility of a variety of substances was next compared, 
solution of 20 parts of the substance in 100 ae being always used. 
ees 
