120 
of cylindricity. For these determinations only conidia of approximately 
modal length were used, and to obviate unconscious selection, measure- 
ments were made of only the left side of the conidium, the basal end being 
toward the observer. Determination from 11 conidia of H. No. 1 of sub- 
cylindrical shape gave a coefficient of .74, while that from 53 elliptical 
conidia was .67. 
The above findings for H. No. 1 are as follows: 
Coefficient of longitudinal eccentricity 
FEMI OLINCLIcleete ieee eay ste rece Peheys eratals Sciavs iehal's, t's, a-@ aleia dee: ava. 3e 43 
elton CON nian, tere san Wee ore sre ake soietn evsib ease vas 42 
Siiieesiiie abated | eeyatel han 5 > Gores Onc Gi ce cere Ciera 45 
Coefficient of cylindricity 
PMMINGOMLGI Netra cree etre ice temichae eae esis bald ose 70 
Bilin iical conidia, wate cis Sata ct ence cters st taeeh .67 
Sup oylincditealNCOmidicns er teeeckisrs atte veyhvs © Ststars oxeresevsi ates 74 
Determinations of the coefficient of cylindricity made from drawings 
of Dr. Ravn (91) gave for H. gramineum and H. avenae respectively .86 and 
.95, showing a much higher coefficient than is given by any of the forms in 
my collection. 
A convenient method of measuring conidia for coefficients is given on 
page 179 of the appendix. 
Conidial length.—From five separate plates, a, b, c, d, and e, inoculated 
with H. No. 1 under standard conditions, Graphs 36-40 (Fig. K) of conidial 
length were made. Two additional graphs were made from plate e, one 
of which is designated as e’. The data pertaining to these graphs are 
given with the others (Fig. K). 
The differences between the means of conidial length on plates a to e 
and e’ are as follows: - 
Plates Differences between means Plates Differences between means 
a—b +0.70 + .21 b—e’ —0.19 + .16 
De +0.62 + .24 c—d +0.16 = .23 
a—d —0.78 + .23 c—e +1.40 + .24 
a—e +2.03 + .24 c—e’ +0.11 + .17 
a—e’ +0.50 + .16 d—e +1.24 + .25 
b—c —0.07 + .22 d—e’ —0.28 + .18 
b—d +0.08 += .23 e—e’ —1.52 + .19 
b-e +1.32 + .24 
Since the various plantings on these plates were all from the same in- 
oculum, made at the same time, and under as nearly identical conditions 
as possible, and so kept, the rather large difference in means seen, particu- 
