302 



EFFECT OF CHEMICAL AGENTS 



[Ch. XI 



All of the elements mentioned above, except phosphorus, 

 appear in this list. Thus, ordinary drinking water is clearly 

 well adapted to the nutrition of plants. 



For algce, MOLISCH ('95) used the solution given in the fol- 

 lowing table : — 



TABLE XXX 



Nutritive Solution fok Alg^ 



Grammes. 



Water 1,000.0 



(NH4)2HP04 . 0.8 



(KH2)P04 0.4 



MgS04 0-4 



PeSOj trace 



(2 drops of a 1% sol.) 



Here we note an absence of the calcium used in the solutions 

 for phanerogams. 



Fungi likewise require a mixture of salts, according to 

 Nageli ('80, p. 354) and Beneckb ('95), in the following 

 proportions : — 



table XXXI 

 Nutritive Solutions for Fungi 



Nageli's Solution 



Water .... 

 (NH4)H2P04 

 MgSOi + TH^O . 

 KCI2 . . . 

 FeSO^ .... 

 Organic Compouuds 



Grammes. 



1,000.0 



0.5 



0.5 



0.5 



0.05 



Benecke's Solution 



Water 



KH0PO4 • • 



MgSO^ + THjO 



K,S04 . . . 



NH4CI . . . 



FeSOi . . . 



Glycerine . 



Grammes. 



1,000.0 



5.0 



0.01 



0.5 



10.0 



trace 



50.0 



The solutions differ principally in the proportion of the salts. 



Finally, all animals likewise require a certain quantity of 

 salts. What the proportions are can be shown in tlie case of 

 young mammals, which live during part of their growing 

 period exclusively upon milk. A wonderfully close relation 

 exists, indeed, between the proportions of the mineral con- 

 stituents of milk and of the young mammal before it has begun 

 to suck. This is shown in the analyses made by Btjngb ('89) 

 upon the milk of a dog and the body of its newly-born pup. 



