28 UNIVERSITY OF WISCONSIN STUDIES 
THE DIsrriBsuTION OF THE COLON-AEROGENES GROUP 
When physiological or morphological characters are cor- 
related with a definite habitat, their taxonomie significance is 
greatly increased. The restriction of species of the higher 
animals to a more or less definite habitat is too well known 
to need discussion. Among the plants this relation is even 
more marked and the fungi are sometimes limited in their 
habitat to a single species of host plants. The source of the 
various tentative groups into which we have divided our 689 
cultures should be in a way a test of the validity of this 
grouping. The distribution of these groups according to their 
origin is shown in Table V and Figure 7. 
TABLE V 
SHOWING THE DISTRIBUTION OF CULTURES ACCORDING TO ORIGIN 
Human Bovine Water Milk Grains 
Type Feces i Feces 
No.|Per cent||No.)Per cent||No.;Per cent||No.|Per cent||No.|Per cent 
CO: 
—--- 106 Sacech. + .......... 23 14.45 86 54.08 27 16.98 21 13.20 2 1.25 
He 
COs 
—--,1.06 Saech, — .......... & 38.07 61 27.98 32} 14.67 37 | 16.97 5 2.99 
He 
CO2 
—--- 1.5-3.0 Adonite + ....) 46} 33.09 1 71 46 | 33.09 32 | 23.02 14 | 10.07 
He 
i 
Cis 
-—- 1.5-3.0 Adonite — ....| 0 ]......... OF ba as a segs 14 13.59 12 «(11.65 77 | 74. 
COz 
CO: 
Gel. liquef. aati SS na Gee cak 10) leas ce veers Of sag neat oh 4 83.35 1 8.33 7} 58.83 
He | 
COz | a 
Gel. liquef. —--- 1.53.0 ...... 0, lnurnames He Oo ase ian 9 15.51 11 18.96 85; 65.51 
He | 
This collection eannot be taken as accurately representing 
the relative distribution, because in some eases the isolation was 
selective, as, for instanee, when a special attempt was made 
to get high ratio cultures from feces. No attempt was made 
to isolate liquefiers and the results may be misleading in that 
