Scientific Intelligence. Itl 
figure) 5-articulate, shorter than the body, scapus narrowed to- 
wards its apex, articulation obconic, 3d and 4th very short, 
5th oar-shaped, (whence 
generic name,) longer than all 
the preceding united, widened 
towards the apex, which is ob- 
tusely rounded. It may possibly be parasitic in the larva of the 
Amitus described above, as it is somewhat less in size. I pro- 
pose to name the genus Eretmocervs, and the species E. cornt. 
Columbia, Pa., Dec., 1849. 
SCIENTIFIC INTELLIGENCE. 
I. CHemistry AND Paysics. 
1. Onthe comparative Cost of making various Voltaic Arrangements ; 
by Mr. W. S. Warp, (Proc. Brit. Assoc., 1849, in Athen., No. 1142. 
—The author stated that a series of calculations founded on data, pro- 
duced to the Chemical Section at Swansea, showed the efficient power 
of three generally used forms of battery known as Smee’s, Daniell’s, 
and Grove’s, would be equal when 100 pairs of Smee’s, 55 pairs of 
Daniell’s or 34 pairs of Grove’s were used, and that the expense of 
i 
d. Dr. Far- 
ADAY remarked on the imperfect character of the electric light, and its 
7 Inapplicability for the purposes of general illumination ; all objects ap- 
F pearing dark when the eye was embarrassed by the intensity of the 
sing cell, had the property of precipitating the silver perfectly bright, 
lead as it is when thrown down from 
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