Chemistry and Physics. 391 
(1851); on the decomposition of carbonic acid by plants, in which 
the luminous rays were proved to be the active ones, and not the 
In other cases only in abstract; though the fullest references to 
iven. Although we have in this 
to him, since they now have these most important memoirs in 
form convenient for constant reference and consultation. In his 
Seen in the title, namely the dropping of the final s in the words 
Dynamics, Kinematics, Statics, &c. There is a free use with tech- 
nical definitions of Saxon words, as step, spin, twist, squirt, whirl, 
&e. To the following extent quaternions are tacitly introduced. 
Vectors with their sums and fluxes are defined and used. The 
scalar and vector products of two vectors are treated as separate 
products, not as parts of a single one. The quotient of vectors is 
hot used at all. 
The following is the definition of force (p. 2). “It is found that 
the change of motion of any body depends partly on the position 
Is and partly on the strain of contiguous bodies. 
Considered as so de ending, the rate of change of motion is called 
Force.” TI deftoition does not fairly express the meaning 
of the word as good writers have heretofore properly used it may 
¢ seen by trying to put rate of change of motion for force in 
their sentences, For instance, Newton’s first two laws of motion 
