502 
WALTER L. C. MUENSCHER 
Table VIII 
Showing Length, Area, and Amount of Transpiration for One Stoma 
Ave. No. of 
Stomata per 
Sq. Mm, 
Ave. Length 
0' Stomatal 
Pore in Microns 
Ave. Area of 
I Stoma ip Sq. 
Microns 
Ave. Transpira 
tion of I Stoma 
per Hour in 
Grams 
Phaseolus vulgaris 
9-5 
22 
.00010 
Helianthus annuus 
122 
16.5 
47 
.00013 
Pelargonium zonale 2 
112 
II-5 
35 
.00006 
Ricinus communis . 
87 
10 
23 
.00022 
86 
7.5 
18 
.00029 
Zea mays 
81 
19 
48 
.00009 
Primula sinensis 
42 
20 
62 
.00018 
Pelargonium zonale i 
36 
18.5 
51 
.00014 
Triticum sativum 
34 
36.5 
85 
.00023 
largest number of stomata, the average of the upper and lower surface. 
I also recorded the average length of the pore of one stoma in microns, 
the area of one stoma in square microns, and the amount of transpira- 
tion from one stoma in hundredths of a milligram. 
/-PHKSEOLUS lo-ZEK 
a-HEURKTKUS 7-PRlR\JLK 
HO 3-PELRR(;OKIUMC3i i-?E\.KRG.OHlM> 
4-RlC)KV/S ?-TRITICUK 
J-IMPKTIEKS 
30 
Ui) 
/ 
/ 
/ 
/ 
a.0 
/ (!) 
/ 
/ 
/ y 
/ X 
y' { 
® 
® y 
/ \ 
/ \ 
0 
7 
/ > 
--- = IEW&TK0F/P0RE 
=TRK)fSPIRRTlOX 
Fig. 3. Showing the length of one pore in microns, and the amount of transpiration 
in hundredths of mg. per hour for one stoma in the several species. 
The data, namely the length of the stomatal pore and the amount 
of transpiration per stoma for the various species, are represented in 
graphic form by two curves in figure 3. These figures do not show 
