JACQUES LOEB 



91 



fig. 5. Showing influence of mass of leaf on mass of shoot produced in the 

 axil of each leaf. Each upper specimen with whole leaf and the specimen below 

 it with reduced leaf are halves of the same stem. 



V. 



Since it might be argued that the leaves furnish only water for the 

 growth of the shoots, it was necessary to find out whether the dry 

 weight of the shoots regenerated by the stem varies also with the dry 

 weight of the leaves attached to the base of the stem. The dry weight 

 of the basal leaves and of the shoots regenerated by the stem was 

 ascertained by drying these organs in kn electric oven over night at 

 100°C. Some of the experiments mentioned in Tables I and II were 

 used for this purpose and in Table III the experiments in which the 

 dry weights were determined are indicated. 



The leaves, therefore, do not only supply water for the regeneration 

 of the shoots by the apex but dry matter as well. This conclusion is 

 supported by the experiments to be discussed in the next chapter. 



