808 Comparative Chemistry of Higher and Lower Plants, | 
the very great importance of minute chemical research at leat 
in certain typical members of botanical groups; without such 
investigation a great deal of our present knowledge is worthless $ 
The changes of the chemical compounds within the cell, the 
simultaneous appearance of two or more compounds always ia : 
association, and the predominance of some one compound it § 
certain plant groups, should be seriously considered before the 
evolution of plant chemistry be definitel y approved or condemned. | 
These facts suggest questions which must be answered before’ 
further advance can be made in plant biology. : 
The practical application of a theory, which advocates that the $ 
morphology of a plant is the outcome of its chemistry, will be 3 
used by the chemist to direct him to certain plant groups for " | 
compound which experience proves to be present with simit 
morphological characters in other roups. cal 
It has been recently ad Sat many of the chemi 
compounds may serve the plant as means of defence agains 
animals, and when we camphorize our furniture and ee 
w 
in quinine manufacture, independent of contempt ia "i Ü 
nas 
of time. 
t M. Léo. E : ienn, 29ih Jams #7 
* 50. Errera, Royal Bot. Soc, of Belgium, Revue Scien., 
* M. Louis Crié, Comp. Rend., t. ciii. P. 1:43 : 
