RELATION OF TRANSPIRATION TO STOMATA 50I 
From this table (Table VII) I could determine whether any rela- 
tion exists between the amount of water lost and the amount of linear 
units of stomatal pore. These results do not show any constant 
relation between the amount of transpiration and the number of 
linear units of stomatal pore. The two species, Impatiens sultani 
and RicifiMS communis, both of which have a small amount of stomatal 
pore per unit of leaf surface, have the two highest amounts of transpir- 
ation per unit of leaf surface. Phaseolus vulgaris also has a high 
transpiration in proportion to the amount of stomatal pore per unit 
of leaf surface. 
a.€-o 
a.00 
-- =STOMMTKl PORE 
— =TRHKS?IRRT10)f 
\ 
\ 
100 \ 
© \ 
V \ 
■fo 
/-HEURKTHUS t-PElRRG.OinUKl^i^ 7-PH)MVLR 
a-ZHn 5-PHRSEOV-VS HM.P;iTlEKS 
0 
Fig. 2. Showing the amount of transpiration in mg. per hour per sq. do. leaf 
surface and the number of linear units of stomatal pore in microns per sq. mm. leaf 
surface. 
The data of Table VII are also shown in graphic form by two curves 
in figure 2. The two curves are drawn to separate scales. In the 
transpiration curve the side of each square represents fifty milligrams. 
In the curve showing stomatal pore the side of each square equals 
500 microns. In other words the latter curve represents values ten 
times as large as the former, or each unit equals ten microns in the 
curve which represents stomatal pore. 
In Table VIII I have arranged the species in the order of the 
