92 P. E. Chase on Mechanical Polarity. 
validity of any inferences as to magnetic motions that are drawn 
from the effect of impulses which are confessedly purely me- 
chanical. 
Such doubts may perhaps be removed by considering, Ist, 
the well-known danger of being led astray by the simplest un- 
detected fallacy in @ priori reasoning, which renders it desirable 
in experimental verifications of every philosophical in- 
ference; 2d, that if all forms of force are, as 1s so generally sup- 
, mutually convertible, the convertibility can only be dis- 
covered through their mechanical momentum; and 34, that all 
the experiments illustrate the magnetic influence of a fluid controlled 
by the reaction of disturbed gravitation. I have shown that forces 
proceeding in lines corresponding to those which represent solar 
and planetary* influence produce magnetic deflections equiva- 
lent to the observed solar-diurnal, annual, decennial, and secular 
y me 
nal [2], iv, 379, 382), it will be generally admitted that the 
quantity of motion is the proper measure of force. In an or- 
der-clap, w occasioned 
air in the restoration of disturbed equilibrium; and, on t 
? Mr. Ferrel refers, for a beautiful illustration of some of his propositions, to 
Foucault’s experiments with th is Journal, [2]. xv, 263 ; xix, 141). 
with p ‘ oh 
° The connection which has been pointed out by Sabine between Schwabe’s theo- 
| tie 1 
ov 
retic course of the et fe phenomenon and the magne 0-11 year a 
interest from Prof. Wolf's continued 
(Phil. Trans., 1852, Art. VIIL 
i ions into the i 1 planets upon the sun-spo 
{See Monthly Notices of the Royal Ast. Soc, May 12, 1865.) Me ; 
4 Is the “ pulsating molecular force” of Prof. Dana’s hypothesis material or imma- 
terial? If the latter, is it intelligent or unintelligent? How can momentum be 
imparted by velocity without material mass, unless it be by the direct and volun- 
tary act of a competent intelligence f 
