EXPERIMENTS ON VEGETATION IN SOLUTIONS. 353 



i 



face of 720 square centimetres ; water exhaled = 1 litre ; to the 

 solution was added 0-1 gramme of phosphate of iron ; radication 

 strong. This period differs from the preceding in the quantity of 

 KOP0 6 given being double. 



ABC 



Nitric acid 1-0800 ? V 



Sulphuric acid 0-2475 0-1716 0-0759 



Phosphoric acid 0-1250 O'OOOO 0-1250 



Lime 0-3420 0*1440 0*1980 



Magnesia 0-1165 0'0860 0'0305 



Potash... . 0-5518 0'2160 0'3358 



2-4628 0-6176 0'7652 



Proportions of bases and acids, 



Given: 2 . 9 . 



MgO CaO 



Absorbed: - 6-1; = 1-T; 



CaO 



IV. Period. From July 27 to August 1. At the commence- 

 ment the plant weighed 147 grammes, had eleven leaves, with a 

 surface of 1160 square centimetres; water exhaled = 1 litre; to 

 the solution was added O'l gramme of phosphate of iron ; the 

 roots became distinctly reddish yellow. The plants received twice 

 as much KOP0 5 as in the second period. 



ABO 



Nitric acid .................. 1-0800 ? ? 



Sulphuric acid .............. 0-2475 0-1374 0-1101 



Phosphoric acid ............. 0-1250 0-0000 0'1250 



Lime ....................... 0-3420 0-1188 0'2232 



Magnesia ................... 0-1165 0-0719 0-0446 



Potash... . 0-5518 0*1296 0'4222 



2-4628 0-4617 0-9211 



Proportions between bases and acids, 



Given : 

 Absorbed : 



To ascertain how far the results from this artificial mode of 

 cultivation may be compared with those produced under natural 

 circumstances, maize of the same kind was planted in the garden 

 in the middle of May. The latter were exposed to the same at- 

 mospheric conditions as the experimental plants. On August 1, a 

 plant from the garden of the same period of vegetation as the ex- 



