§ 1] UPON THE KATE OF GROWTH 301 



TABLE XXVin 

 NniKiTi'vE Solutions foe Phanekogams 



Sachs' Solution Gkammes. 



Distilled water 1,000.0 



Potassium nitrate, KNO3 1.0 



Calcium sulphate, CaS04 0.5 



Magnesium sulphate, MgSOi 0.5 



Calcium phosphate, CaHP04 0.5 



Ferrous sulphate, FeSOi trace 



Sohimper's Solution ('90) 

 Distilled water . 600.0 



Calcium nitrate, Ca(]Sr03)2 ..... 6.0 



Potassium nitrate, KNO3 1-5 



Magnesium sulphate, MgSOi ... 1.5 



Neutral potassium phosphate, KsPOj . . . 1.5 



Sodium chloride, NaCl . 1.5 



Fkank's Solution 

 Water, ^L distilled ; fa Berlin reservoir water . 1,000,000.0 



Calcium nitrate, Ca(]Sr03)2 . ... 267.4 



Potassium chloride, KCl 121.5 



Potassium phosphate, K3PO4 . . . . 101.9 



Magnesium sulphate, MgSOi • 7 HjO . . . 100.2 



Perric chloride, PeaClo 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 (JoEDAK and Richards, '91) : — 



TABLE XXIX 



Parts by Weight of Inokganic Matteks in 1,000,000 Parts op 

 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 



