CHAPTER III. 



FURTHER EXPERIMENTS ON NUTRITION. 



Section A. Wat&r-cultm-e. 



Skction B. Experiments on Fungi and on Droaera. 



Section C. Absorption and other functions of the root. 



Section A. Water-culture. 



(74) Method. 



To show what elements are necessary for the 

 development of a green plant and the relative proportions 

 in which they are absorbed by its roots, the method of 

 water-culture should be used, either alone or in com- 

 bination with studies on the ash obtained by incinerating 

 the plants cultivated. 



Full directions for conducting water-culture experi- 

 ments are given in Sachs' Lectures, Eng. Ed. Lect. xvii. 

 p. 283, and by Detmer, Ch. i. pp. 1—6'- 



Although we have never succeeded in preventing the 



failure of a small proportion of such experiments, the 



liability to failure may be much diminished by careful 



' Compare also Acton, Proc. Boyal Soc. Vol. xltii. (1889), pp. 

 X52-157. 



4—2 



