7 2 New combe. — Cellu lose-E nzymes. 
cytohydrolysts proper with weak action on starch ; or the 
extracts may be mixtures, each of diastase and a cyto- 
hydrolyst. If the former of these two last hypotheses be 
true, then we must regard diastase as a cytohydrolyst also ; 
since it is known to dissolve both starch and reserve cellulose. 
To my mind the evidence is fully as strong for the second 
hypothesis as for the first. 
A. Actiofi of Ferments on Starch , when the Action on 
Membranes is nearly equally intense for all Extracts. 
In order to compare the solubility of starch with that of 
reserve cellulose by means of the cytohydrolysts here treated, 
powdery extracts of the malt of Hordeum vulgar e, of the 
cotyledons of Lupinus albus , of the cotyledons of Phoenix 
dactylifera, and of the endosperm of Phoenix dactylifera , were 
prepared by the alcohol-method as described in the first 
section of this paper. From these solid extracts, and from 
the Aspergillus -ex. tract, strong watery solutions were made 
which by repeated tests were brought to nearly like intensity 
of action on reserve cellulose. These solutions were acidu- 
lated to *o5°/ o with hydrochloric acid. In order to bring the 
ferment-solutions to nearly the same degree of strength 
relative to their action on reserve cellulose, very thin sections 
were made from dry Barley-grains ; the sections were killed 
in alcohol, chloroform, or formalin, extracted for fifteen to 
thirty minutes in water, and the starch brushed out of their 
cells. Preparations with the various ferments were then made 
on glass slides as described on p. 53, chloroform being 
constantly present, and the temperature maintained at 
32 to 34 . 
To this method of measuring the activity of the enzymes 
the objection may justly be made that it cannot be precise. 
But want of great precision is not thought to vitiate the 
validity of the conclusions. In the first place, the intent of 
this paper does not require very close measurements ; and 
