88 



STUDIES IN INDIAN TOBACCOS. 



former alwaj'^s go straight to the margin, which they naturally 

 meet obliquely, while the latter curve at this point and run 

 almost parallel to the margin. This maj^ be to avoid rupture of 

 the lamina, or it may enable the food channels to serve a larger 

 portion of the leaf for in the case of the acute-angled venation 

 the veins cover a long distance, while when the angle is 90° the 

 distance is very short. If the leaf is broad, this curving upwards 

 of the ends of the veins does not affect the angle near the mid-rib 

 but if the leaf is narrow the latter would be reduced. This may 



Table XXIL 



Venation in Type 9 x Type 51. 



