GIVEN OFF BY PLANTS DURING THEIll GROWTH. 



43 



with their plants fixed upon their scale boards, and placed upon 

 their truck. 



The balance employed for weighing the plants was constructed 

 for the purposes of these experiments by Mr. Oertling of London, 

 and is calculated to turn with the third of a grain when loaded 

 with from half a hundredweight to a hundredweight in each pan. 

 A drawing of them is also given with a jar and plant as in pro- 



