* 
4 
’ 
; 
4 
q 
1894.]' Anatomical and Physiological Researches. 73 
Taken together they form a comprehensive reference text, 
which by its lucid exposition, and simple methods of experi- 
mentation, will be useful as a laboratory manual in directing 
further research on this phase of plant life. As such it is 
available to any worker with even an elementary knowledge 
of the subject. The matter has a twofold importance; because 
of its connection with the physiology of the plant, and because 
through it only are the facts of mechanique capable of their 
true interpretation. —D. T. MACDOUGAL. 
