32 THE WHEAT CULTUKIST. 



of the action of roots / for on them, more than on any 

 other organ of a plant, depends the health of crops of 

 every kind, without one single exception. That the 

 subject has not received more attention is one of the 

 curiosities of science. It is true there are many state- 

 ments of variable character and value ; yet even more 

 speculations respecting the manner in which roots be- 

 have theories of excretion assertions regarding the 

 chemical action roots are said to exercise on dead mat- 

 ter ; but the quiet practical man who reads 'these be- 

 yond the atmosphere of science, is far from being 

 satisfied with what he finds in books. 



" The question as to whether the roots of plants are 

 or not endowed with any special excretory functions is 

 one which has occupied the attention of many natural- 

 ists, as being one of considerable importance, as well to 

 the vegetable physiologist as to the agriculturist, in its 

 application to the principles of alternation of crops. 

 .ISTo absolute conclusion has as yet been come to, the 

 affirmative as well as the negative having been respec- 

 tively maintained, either from general induction, or more 

 rarely from direct observation and experiment. The 

 opinion, however, that no such excretions take place, has 

 been the most generally adopted. 



" The impossibility of closely following under the 

 microscope, in their natural circumstances, vegetable 

 phenomena wliich take place under ground, and conse- 

 quently in the dark, and in an opaque medium, is ob- 

 vious. As a nearest approach to it, Gasparrini has 

 caused the seeds of various plants to germinate under 

 glass, in water, or in well-washed sand, in the dark or 

 under diffused light, and thus examined their roots with- 

 out disturbance in various stages and at various seasons. 



