1915] 
DAVIS—ENZYME ACTION IN MARINE ALGAE 831 
2. Negative results were obtained for cellulase, cytase, 
maltase, lactase, sucrase, amidase, and esterase. 
3. The action of all the enzymes isolated was very slow. 
It is a pleasant duty to acknowledge indebtedness to those 
who in various ways have lent support to this investigation. 
Such acknowledgments are due Dr. George T. Moore for the 
privileges of the Missouri Botanical Garden, especially its 
library and laboratories; to Dr. Benjamin M. Duggar, at 
whose suggestion the problem was undertaken, and under 
whose direction and constant kindly interest it has been pur- 
sued; to Dr. Phillip A. Shaffer, of the Biochemical Labora- 
tories of the Washington University Medical School, for sug- 
gestions and advice concerning biochemical methods, and for 
the courtesy of his laboratory from time to time; and finally, 
to the Woods Hole Biological Laboratory, for the privileges 
extended during the summers of 1913-14. 
Graduate Laboratory, Missourt Botanical Garden. 
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