302 EFFECT OF CHEMICAL AGENTS [Cn. 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. t 



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

 lowing table : 



TABLE XXX 



NUTRITIVE SOLUTION FOR ALGM 



GRAMMES. 



Water 1,000.0 



(NH 4 ) 2 HP0 4 0.8 



(KH 2 )P0 4 0.4 



MgS0 4 0.4 



FeS0 4 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 BENECKE ('95), in the following 

 proportions : 



TABLE XXXI 

 NUTRITIVE SOLUTIONS FOR FDNGI 



NAGELI'S Solution 



GRAMMES. 



Water 1,000.0 



(NH 4 )H 2 P0 4 .... 0.5 



MgS0 4 + 7H 2 ... 0.5 



KC1 2 0.5 



FeS0 4 0.05 



Organic Compounds 



BENECKE'S Solution 



GRAMMES. 



Water 1,000.0 



KH 2 P0 4 5.0 



MgS0 4 + 7H,0 . . . 0.01 



K 2 S0 4 0.5 



NH 4 C1 10.0 



FeS0 4 trace 



Glycerine 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 the 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 BUNGE ('89) 

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



