250 



Canadian Record of Science. 



falls to 1 : 1.94, which approaches more nearly the mean 

 obtained by direct and separate measurement of the tissues 

 themselves. 



Other determinations of the same nature were made by 

 carefully separating the bast from the soft tissues, and 

 measuring each separately. Under such circumstances, 

 both tissues may be straightened out without difficulty. A 

 very large number of such measurements were made, the 

 principal of which are as follows : — 



Relative Length of Tissues by Sepaeate Measurement. 



No. 



Bast. 



Soft Tissue. 



Eatios. 



Remarks. 



1 



14.7 



c. m. 



16.5 c. m. 



1 



: 1.12 



Lagenaria vulgaris, 



2 



5.0 



a 



7.0 " 



1 



1.4 



Megarrhiza fabacea. 



3 



11.8 



It 



13.8 " 



1 



1.17 



« a 



4 



18.0 



a 



22.3 " 



1 



1.24 



Cucurbita pepo. 



5 



21.6 



a 



25.2 " 



1 



1.16 



l£ 11 



6 



15.9 



it 



19.5 " 



1 



1.22 



U It 



7 



12.1 



" 



13.7 " 



1 



L13 



tl tt 



8 



10-0 



" 



11.7. " 



1 



117 





9 



15.4 



a 



19 4 " 



1 



1.26 





10 



15-7 



it 



18.9 " 



1 



1.20 





11 



11.2 



i. 



12.8 ■' 



1 



1.14 





12 



16.5 



M 



20.9 " 



1 



1.26 





13 



22.3 



(( 



26.4 " 



1 



1.18 





14 



16.3 



It 



19.8 " 



1 



1.21 





15 



13.2 



11 



15.3 " 



1 



1.16 







1 



1.20 





From this it appears that, although the mean ratio is 

 necessarily lower, the relation which the ratios bear to the 

 character of the spirals is the same as in the previous case. 

 The mean ratio in the latter case is 1 : 1.20, which may be 

 taken as fairly representing the true relative lengths of the 

 tissues under consideration in the average tendril. 



