566 Holmes-.—A Study in the Anatomy of 
where curves C and D bend upwards, while the second bend in curve E corre¬ 
sponds with the rapid fall in curve C after the maximum point. This shows 
that the decrease in specific conductivity for the internodes at the top is due 
chiefly to the second of the reasons suggested above in discussing curve C, 
namely, the very much smaller size of the vessels near the apex; for from 
curve D it is seen that the proportion of vessels to other elements at this 
region is very large. It must be remembered, however, that the very steep 
ascent at the end of curve D is itself the result of the fact that all the vessels 
in this part are very small, and therefore curve C descends with curve E 
