New combe. — Cellulose- Enzymes. 7 7 
extract, in one hundred and eighteen hours ; by the Asper- 
gillus-extract and the Hordeum- extract, in some period longer 
than three hundred and twelve hours. That is to say, these 
last two preparations were examined for the last time three 
hundred and twelve hours after the beginning of the test, 
and then still contained traces of the middle lamella. In 
the preparations continuing for a long period, the ferment- 
solutions were renewed at intervals varying from two to four 
days, but these intervals were the same for all preparations. 
Finally, in order to determine whether the almost complete 
inability of the Date-endosperm-extract and the Lupin-extract 
to dissolve starch might be due to some clogging component 
of the solutions, saturated solutions were made not only 
of these two extracts, but also of those of the Barley, 
Aspergillus , and Date-cotyledons. A portion of each of these 
solutions was then diluted with water to three-fourths full 
strength, and another portion to one-half full strength. Each 
ferment therefore was in solution in three strengths. Pre- 
parations were now made, as described before, by introducing 
into these ferment-solutions, on glass slides, starch-grains 
and sections of the Barley-endosperm. It was found for 
all kinds of ferments used that the strongest solution in 
each case acted most energetically on both starch and cell- 
membranes, and the most dilute solution acted in each case 
the least on both starch and cell-membranes. 
IV. Review and Summary. 
In reviewing and summarizing the results obtained in this 
work, it is to be noted first, that, in addition to the extract 
of Barley-malt, the extracts of Aspergillus Oryzae , seedlings 
of Lupinus albus , and seedlings of Phoenix dactylifera have 
been shown to be highly cytohydrolytic. 
Testing these four extracts, each with three different kinds 
of walls, it is worth remembering that no extract has shown 
itself peculiarly active toward any one kind. All the extracts 
have dissolved the walls of the starch-bearing cells of the 
