Miscellaneous Intelligence. 449 
the hand holding it, a numbness, and, at times, an absolute inability to 
relax the grasp. It seemed as though an involuntary contraction of the 
For the examination of this matter, the apparatus seen in the woodcut 
was devised: 6 is made to re- 
t 
tance ra is equal to ath of an 
inch. To protect the hand 
from blisters, the brass tube ¢ encloses the rod, fitting it very loosely. 
Vhen the hand is laid on this sheath, the rate of rotation being be- 
tween 40 and 60 revolutions per second, a feeling of numbness is first 
perceived ; the muscles involuntarily contract with considerable force, 
4. Large Object-Glass.—Messrs. Alvan Clark & Sons, of Boston, have 
completed on their own account, an object-glass with a focal distance of 
sixteen feet, and clear aperture of twelve inches. It has a nice defining 
power, and Mimas, the nearer satellite of Saturn, was seen with it Feb, 
14th and March 2d and 4th. 
der consideration and 
So important an act 
y rested in the material 
le science has much to expect every 
Way from the proper discharge of such a commission. 
b4 OND SERIES, Vor. X XIX, No. '87.- MAY, 1860. 
s7 
