146 Miscellaneous Intelligence. . 
commend it to all those who may have occasion het hy aay specimens of 
the siliceous organisms in soundings, guano, , &c. Dissolve o 
the lime compounds, if present, by means of Sieve or chlorohydric aci¢ 
ydizing action that in a few moments a carbonaceous material as black 
as ink will become sadfoatly clean and colorless. Nothing now BEN 
t 
addition of water and repeated decantations. J also would advise 
the materials thus cleaned should not be dried, but should be kept 
bottles with a little alcohol, which prevents their felting together, at 
does not allow the growth of the byssoid plants which often wy 
water. ‘ 
It is necessary to caution those not familiar with chemidep ante 
using the chlorate of potassa with sulphuric acid in any ha than 
above directed, as violent and dangerous explosions might rest The 
uenc 
mals, (L Institut, No. 11 . J. Motescuorr has placed so 
in a glass tube a “exposed them to a current of air containing 
bonic acid, first exposed to reflected sun-light, and then in t 
He finds that the quantity of carbonic yagi given out by the 
the ya era light is one-quarter more than in the dark, other co 
ing the 
h there is a large quaniiey "of native iron 
Walter R. Johnson.—This instrument 
1855, (Paris,) in an neti de 
Journal {2], xv, 263, and xix. 
one of great eae and utility 
‘tion ; and it derives increased i 
of the gyroscope. 
