94 



As may be seen in Tab. XI, maximum growth occurs when the stalk 

 has attained to about half its full length. If, therefore, the rate and 

 mode of growth before the maximum, were the same as after it, the 

 ascending slope would be similar to the descending one, and we should 

 have a curve somewhat isoceles-triangular. The completion of the curve 

 which would prove whether this supposition is true or not, needs further 

 observations. 



In order to know which part of the same stalk grows most vigorously, 

 I have at first divided the upper 15 cm. of the leaf-stalk I into 15 zones 

 and marked with carbon-ink every cm. and then measured the length of 

 every zone once a day. The results of observations are given in the 



following table : — 



Tab. XII. 1} 



LEAF-STALK-I. 



X. Date. 



Aug. 























No. orN. 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



zone. x. 





























1.0 



0.0 



0.0 



0.5 



1.0 



2.0 



2. + 



2.5 



2.5 + 



2.7 



3.0- 



(apex) 1 



1.0 

 1.0 



1.0 



... 



3.0 

 4.0 

 5.0 



5.0 



9.0 



lO.O 



7.5 

 13.5 



11.5 



14.0 



14.0 



15.5 



17.2 



19.0 



20.0 



II 



14.0 

 10.0 



14.0 

 10.0 



14.0 

 10.0 



14.0 

 10.0 



14.0 



III 



10.0 



10.0 



10.0 



IV 



1.0 





6.5 + 



8.0 



8.0 



8.0 



8.0 



8.0 



8.0 



8.0 



8.0 



V 



1.0 





5.0 



6.0 



6.0 



6.0 



6.0 



6.0 



6.0 



6.0 



6.0 



VI 



1.0 



... 



5.0 



5.+ 



5.+ 



5.+ 



5.+ 



5.+ 



5.+ 



5.+ 



5.+ 



VII 



1.0 

 1.0 





4.5 



4.0 



5.- 



5.- 

 4.0 



5.- 

 4.0 



5.- 

 4.0 



5. — 

 4.0 



5.- 

 4.0 



5.- 

 4.0 



5.- 



VIII 



4.0 



4.0 



IX 



1.0 





3.5 



3.5 



3.5 



3.5 



3.5 



3.5 



3.5 



3.5 



35 



X 



1.0 





3.- 



3.- 



3.- 



3.- 



3.- 



3.- 



3.- 



3.- 



3.- 



XI 



1.0 





2.5 + 



2.5 + 



2.5 + 



2.5 + 



2.5 + 



2.5 + 



2.5 + 



2.5 + 



2.5 + 



XII 



1.0 





2.5- 



2.5- 



2.5- 



2.5- 



25- 



2.5- 



2.5- 



2.5- 



2.5- 



XIII 



1.0 





2.+ 



2.+ 



2.+ 



2.+ 



2.+ 



2.+ 



2.+ 



2.+ 



2.+ 



XIV 



1.0 





1.5 



1.5 



1.5 



1.5 



1.5 



1.5 



1.5 



1.5 



1.5 



(base) XV 



1.0 





1.5- 



1.5- 



1.5- 



1.5 



1.5- 



1.5- 



1.5- 



1.5- 



1.5- 



Sum. 



15.0 



36.0 



53.5 



68.5 



76.5 



81.0 



83.5 



85.0 



86.7 



88.5 



89.5 



This table shows that the growing zone of the stalk is restricted to 

 i'ts upper part and that the maximum growth takes place a little below 

 the n\x-x ; thus, this zone of maximum growth is constantly moving 

 upwards as the plant becomes fully grown. 



1) In the table the growing zone is separated from the non-growing one by a horizontal 

 line, and the iiiiixiiniiui growth is denoted by thick letters. 



