THE ASSIMILATION OF CARBON BY AUTOTROPHIC PLANTS. I 117 



their results and those of SACHS, and have found that the increase in weight in 1 

 a leaf is much greater than one would expect from the amount of carbohydrate ' s 

 formed. They draw no conclusion from this (as one might well expect) as to the 

 formation of compounds containing little carbon, but hold that SACHS'S half- 

 leaf method was a very inexact one.] 



Since in SACHS'S experiments a square metre of leaf surface of the sunflower 

 produced 1-8 gr. of carbohydrate, it must have absorbed, roughly speaking, 

 1-5 litres of carbon-dioxide per hour. This would appear at first sight unlikely, 

 taking into account the small amount of carbon-dioxide in the air as well as 

 the capacity for absorption of the plant. We shall deal in our next lecture in 

 detail with these relations. 



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