Chemistry and Physics. 229 
his result as furnishing a strong argument against the law in 
question, as in his opinion the law loses all chemical and physical 
ote heat and internal work.—Berichte der Deutschen Chem. 
@s., Jahrgang v, p. 303. Ww. G. 
4. What determines Molecular Motion?—The Fundamentat 
Problem of Nature ; by Mr. James Croxt.—Mr, Croll closes an 
article of 25 pages in the July number of the Philosophical Maga- 
ane with the following remarks 
tery. This is the cherished hope of modern evolutionists, and of 
the advocates of the physical theory of life. But it is a mental 
i alized. A little consi- 
(eration might satisfy any one that chemistry and physics will 
€ terms light, heat, electricity, magnetism, &c., are different 
hames which we apply to different modes of molecular motion ; 
be known regarding them, yet it woud not afford us any explan- 
ation of the cause of the determination of molecular motion m 
organic nature. 
. The character of a cause may often to some extent be judged 
indirectly from the nature of the effects produced. —_ It is from the 
effects produced that we know, for example, that that mode of 
hat 
he ff 
this difference consists ; but it enables us to conelude with certainty 
that there is a difference. Effects which are electrical we refer to 
that unknown mode of motion called electricity. We do not 
i electrical effects to gravitation or to heat ; fi 
tween this effect and any electrical effect is ummeasura 
