THE ASSIMILATION OF CARBON BY AUTOTROPHIC PLANTS. I 117 



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

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

 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 i-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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