182 BOTANICAL GAZETTE [SEPTEMBER 
DATA FOR SERIES I, 
7 Total Green wt. "7 
Treatment eertl nae <P. onal Js “ ee 7 ir 
co SE ae r | 29.7 | 27.657 | 0.51 | 1.074 gue 
“+ 5000 p. p. m.3 manure... 2 | 41.9 | 42.182 |) 6.98 99 | 57-4 
bi Tooog. “44 3 | 52-6| 45.302 | 0.87) Sr 
“ + 15000 “ “ 4 59.5 50.658 17 60.1 
‘+ 20000 te ne 5 63.4 62.304 | 1.165 | 1.02 | 54.2 
re s00gn.. ey 6 | 76.2 | 83.207 | 1.635 | 0.91 | 40-4 
". +a0000. s 7 | 83.7 | 85.982 | 1.760 | 0.97 | 47:5 
ar Seto... = 8 | 92.4 | 89.372 | 1-930 | 1-03 | 47-9 
Abscissas are here taken proportional to the amounts of manure in 
the different baskets, and a curve is drawn for each column of figures 
in the table, these being first reduced so as to be mutually compare 
ble by calculating each quantity in terms of that for basket no. % 
considered as unity. The numbers so obtained are plotted as ordi 
nates for their respective curves. Thus the curves all start at the 
same point and their nearness to coincidence or parallelism 1s 
the criterion for judging whether or not the different sets of meas 
urements vary in the same order. The derived numbers, fom 
which the curves are plotted, are placed upon them and need not be 
tabulated. The basket numbers (which correspond to the treat: 
ments, see the table) are placed below the curves in a horizontal vag 
A symbol corresponding to a column in the table is placed at the right 
of each curve and designates the particular set of data for which a” 
drawn. Thus, T is the curve of transpiration, A of leaf area, Wi of 
ry aoe 
leaf weight, 5 transpiration per 2°" of total leaf area, and qj 
transpiration per gram of green leaves. 
t is seen immediately that the curves for transpiration, leaf 
weight, and leaf area all lie quite close to one another. Judging = 
relative growth of the different cultures by any one of - 
curves results in arranging the baskets in identically the same 5 
3p. p. m. will be used throughout to denote parts per million, by — 
4 The transpiration figures are always in grams. 
5 Leaf area is given for only one side of the leaves, always in square centimeters: 
6 In grams. 
ees 
7 Transpiration per 254° of total leaf area. 
8 . . 
_ * Transpiration per gram of green leaves. 
