Intelligence and Miscellanies. 399 
with other crystals, aud each halo will be either double when’ 
the refraction is considerable, or modified by various colors, 
when the refraction is wea e effects may be varied ina 
curious manner, by crystallizing on the same piece of glass, 
salts of a determinate color. this means, halos white and 
colored succeed each other.—Bulletin technilogique Aout, 
1828. 
. Corroswe Sublimate.—At the common temperature, 
— parts of ether dissolve one part of corrosive sublimate ; 
but by taking equal parts of camphor and aye it re- 
quires but three parts of ether for solution. By increasing 
the proportion of the camphor, we have the following results: 
4 parts of ether wi ith 4 
8 
“ : oe 4 oe “ 
: os os “ 16 as oe 8 os 6s 
3 parts alcohol, common temperature, dissolve 1 part of sub- 
limate ; in addin ng to the latter, only the half of its weight of 
camphor, one and a half an of alcohol is sufficient for the 
solution.—Fev. Bul. Mars. 1 
* * * * * * 
4, On the Gossamer Spider, by Mr. Bowman,—Severa 
In a few —— ges they were seen ee ace 
ong, without any apparent effort ; their legs contracted 
together, cad lee perfectly quiet on pie: backs, suspended 
from their silken parachutes, and presenting to the lover of na- 
ture a far more interesting spectacle than the balloon of the 
philosopher. ‘“ One of these natural aéronauts I followed,” 
says Mr. Bowman, “ which, sailing in the sunbeams, had two 
