1] UPON THE RATE OF GROWTH 301 



TABLE XXVIII 

 NUTRITIVE SOLUTIONS FOR PHANEROGAMS 



SACHS' Solution GRAMMES. 



Distilled water 1,000.0 



Potassium nitrate, KN0 3 1.0 



Calcium sulphate, CaS0 4 0.5 



Magnesium sulphate, MgS0 4 0.5 



Calcium phosphate, CaHP0 4 0.5 



Ferrous sulphate, FeS0 4 trace 



SCHIMPER'S Solution ('90) 



Distilled water 600.0 



Calcium nitrate, Ca(N0 3 ) 2 6.0 



Potassium nitrate, KN0 3 1.5 



Magnesium sulphate, MgS0 4 1.5 



Neutral potassium phosphate, K 3 P0 4 . . . 1.5 



Sodium chloride, NaCl 1.5 



FRANK'S Solution 

 Water, -fa distilled ; ff Berlin reservoir water . 1,000,000.0 



Calcium nitrate, Ca(NO 3 ) 2 267.4 



Potassium chloride, KC1 121.5 



Potassium phosphate, K 3 P0 4 101.9 



Magnesium sulphate, MgS0 4 - 7 H 2 .... 100.2 



Ferric chloride, Fe 2 Cl 6 trace 



The first differs from the others chiefly in the absence of chlo- 

 rine. 



How fit ordinary waters may be to provide all these salts is 

 shown by this analysis of the ordinary drinking water of Bos- 

 ton (JORDAN and RICHARDS, '91) : 



TABLE XXIX 



PARTS BY WEIGHT OF INORGANIC MATTERS IN 1,000,000 PARTS OF 

 POTABLE WATER 



Sulphuric acid 4.58 



Chlorine 4.00 



Alumina and oxide of iron 0.75 



Calcium oxide . 6.45 



Magnesia 1.60 



Potash 0.92 



Soda 5.00 



Silica 3.04 



Nitrates . 0.25 



