May 19,1923 Statistical St^ldy of Biologic Forms 
Constants. 
Coefficient of 
variability. 
10 t>.vo 0 0 
lOTfio Tt (SCO a CO cs fociN 
l-H-H -H-H -H 4 ) -H -H-H-H Ijli 
Ovt^t^vO 00 M w t^OvM 
vD rT w O^'-O 00 CO nO ^ . . 
... . .• . . 0 0 
OOvOt^vO VOILO t^vo totn HM 
1 Standard 
deviation, j 
OGOt^ 20 lOlO Tt vO 'tJ- t^lOliO oOoO 
000 0 00 0 0 0 000 00 
■S- 4 -H -H - 4 -H 4 ) -H -H 4 ^ 4 I 4 ^ 4 ^ 4 I 
VOOO N vot^io coo 'it CO 
MC^O^ t— coO co M <N rJ-HO 
M** * WW M H M HMH HH 
Mean. 
hQsOn 00 0 OoOt^ P«P« 
hOO 0 00 0 0 0 hOO wi-i 
- 44 ^ 4 ^ 4 J 4 ^ 4 ^ 41 4 ^ 4 ) 414 I 4 H 4141 
OOoO VO tTn 00 vO Ov hOvm 
-t-cOOvoO OvOvOO 0 t^oO CO vO 
CO CO H dvod vo dv dv^dv vdvo 
HHM M WM H H H MHH HH 
Total 
001 
001 
001 
001 
001 
00 s 
001 
002 
001 
002 
oS 
oS 
oS 
oS 
1 
1 
Spore classes according to width. 
. . . . . . . . • H • 
2 S. 
TO 
« 
6 
4 
2 
1 I 
« 
• • . • ^ vO oO w • “ 
• ••• .* 
s 
. . . . W't • * vO t^VOCO HC< 
■ . • . tT • . c>< H H H 
21 
0 
W 
. . . . 0 Ov Tf w CO 10 rl-oo vo 't 
• • • • r>. (N 00 CO 'T <N 
H 
• . OO't'O *-< 'toOOvO vOvO 
• • • • coco H H rt HCICO 
H 
• • • • t^csi vO N 0 rfHOO vOcO 
• • • • HOI tJ- CJ C« HHH HH 
• • • t^O 00 covo vowrT r^oo 
• • • H 10 CO CSI 
M 
CO • • • CO w vo N C» ' H • 
tJ- Cl 
0 w 
d d 
H 
vO CO • • 't 00 • • • 
. . . ... 
rtvO 
H H 
H 
CO Tf H H . • 10 • 
M M H « • . . • 
vO vo 
ro 
H 
Ov CO H VO • • H • • • • 
H Cl Cl • • .... 
CO CO 
:i. 
ti - 
w 
• « « « • • • 
c^o •• • • • •* 
H CO • • • ' • • • 
H H 
a*. 
H 
H 
dHCOH •• • • • •• 
H ....... 
§• 
H 
• • • • • • * * • • 
1 
i Host plants or en¬ 
vironmental con- 
1 ditions. 
Berberis vulgaris 
Berberis sieholdii 
Berberis vulgaris 
Berberis brevi- 
paniculata. 
Avena saliva. ... 
Bromus tecto- 
rum. 
Phleum pratense 
Dactylis glome- 
rata. 
Normal condi¬ 
tions. 
Excessive heat . 
Deficient light. 
Droup-ht ..._ 
, 
Triiicum vulgare 
Triticum dicoc- 
cum. 
Spores and biologic forms. 
Aeciospores: 
P. graminis secalis . 
Do . 
P. graminis agros- 
tis. 
Do .!... 
1 
Urediniospores: 
P. graminis avenae. 
Do . 
P. graminU phlei- 
pratensis. 
Do . 
P. graminis tritici. 
Do . 
Do . 
Do. 
Teliospores: 
P. graminis tritici . 
Do . 
•ON 
H d CO ‘t tO'O- t^OO Ov Owd cOTf 
1 l_l H H H H 
557 
