418 Scientific Intelligence. 
thermometer, and then by means of a thermo-electric _ com- 
pared with the aeons indications, and measuring appro 
mately the specific heat of the cushions and the disk, tekine into 
consideration the losses in the air. The quantity thus obtained 
was likewise deducted from the calculated w 
while the other was in communication with the earth. 
tubes were immersed in a large reservoir containing acidulated 
water, and united by means of a long string wetted, to serve as a 
No Ex ries. Wor! Equiv. 
12 17 0°578 272°84 471°99 
7 42 1°428 649°74 455.00 
9 5 0°170 79°5 467°64 
The mean of these results gives for the mechanical equivalent of 
pond the number 464°87.— Bib. Univ., 252, 1873, Phil. Mag., ae 
xlvi E. C. 
hen one coil only was used, the magnetism at a distance 7 
was expressed by the quantity oo) in which A= 11°95 anda= 
1-161 in this particular case. ie other words, the distances being 
taken in an arithmetical progression, the magnetism w would dimin- 
ish geometrically. If the length of the bar was not indefinitely 
great, the effect produced was the same as if the curve representing 
the distribution of the magnetism was uct and the ordinates 
thus obtained added to those of the first ¢ 
If now both coils were onpleret an Peas currents sent in the 
same direction, the reflected portion of one neutralized that of the 
si wi 
theory of magnetism. All these Sate ons are sustained by 
stom of observations which show a Faiattghle eames with 
ie 
LV 
Sik ‘orsion Me Gionak Gorz presented to the Ro oye, 
lety, at a recent meeting, a communication on the twisting ° 
