THE CHEMICAL MECHAMSM OF RECENEHATION 5 



Althoiitili the leaves eut into four pièces prodiiced almost 

 twice as many shoots as their intact sister leaves, both pro- 

 ducecl approximutely the samemassof shoots, namely2,83i gm. 

 and 2.998 gm. respectively. We may, therefore, slate that 

 equal masses of sister leaves produce the same mass of shoots 

 even if the number of shoots differs considerably. 



When the pièces into which a leaf is eut become too smail, 

 the notches may not regenerate, or, if they regenerate, they may 

 do so with some delay. The mass of shoots produced by such 

 leaves is, therefore, liable to be a little smaller than that pro- 

 duced by their intact sister leaves, though the différence is not 

 great enough to obliterale the law. Table III gives a compa- 

 rison between the masses of shoots produced in 12 intact leaves 

 and their 12 sister leaves each of which was eut into 8 pièces. 

 Duration of experiment 36 days. 



Table III. 



The mass of shoots produced by the intact leaves is only 

 slightly greater than that produced by their sister leaves, each 

 of which was eut into S pièces. 



3. — In ail thèse experiments the masses of the !wo sets of 

 sister leaves were approximately equal. It was necessary to 

 find out how the mass of shoots would vary if the masses of 

 the two sets of leaves varied considerably. For tliis purpose 

 large pièces were eut out of the center of one set of leaves, 

 while their sister leaves remained intact. It was tound that 

 the mass of shoots produced in the two sets of leaves varied 

 approximately with the mass of the two sets of leaves. Table IV 



