378 APPENDIX E. 



August 6 and 7, the male flower, consisting of seven single ears, 

 was fully expanded from the sheath, the stem was strong, and 

 70 centimetres high. On August 7, a fully formed female 

 flower appeared ; on August 9, the anthers began to shed their 

 pollen. 



Nitric acid . 

 Sulphuric acid 

 Phosphoric acid 

 Lime 

 Magnesia 

 Potash . 



2-5662 0-5580 0-9277 



Proportions between bases and acids, — 



Given: ^aO . KO^j. S^^^-l 

 MgO CaO MgO 



., 1 , CaO . Q KO , e SO, ^ „ 

 Absorbed: ^-^ = 5-9 ; -—^=1-8 ; --^ = 2-3 

 MgO CaO MgO 



As the plant in this period flowered, and earlier experiments 

 had shown that maize dug up at the period of flowering and 

 placed in river water furnished still ripe seeds, and also by the 

 addition of the salts which the plant in each period had taken 

 up in proportion to its increase in weight in the first four 

 periods, it appeared that it must contain fully as much salts as 

 the plant in its normal condition in the field takes up, if placed 

 from this period only in distilled water. 



VI. Period. From August 10 to 16. — At the commencement 

 the plant weighed 255 grammes, and had 15 fully expanded 

 leaves with a surface of 2640 square centimetres : 2 litres of 

 water were exhaled. 



On August 10, the anthers had almost completely shed their 

 pollen. The stem shot up rapidly, and on the 12th it measured 

 to the tip of the fiower 1 metre in height. On the 13th a 

 second female flower appeared, which was surrounded with 

 paper to protect it from dust. On August 16 the height of the 

 plant was 1*1 metre; it did not grow any more. The fruit- 

 bearing stalk was, on August 16, already 2 decimetres long, and 

 had below a thickness of 4 centimetres. 



On August 16, the water was drawn off and analysed. 



