1915] 
DAVIS—ENZYME ACTION IN MARINE ALGAE 799 
acted upon, although perhaps a little more slowly. This action 
is definitely progressive with starch, dextrin, and laminarin, 
but with glycogen it takes a sudden jump during the 15—45- 
day period, then remains practically stationary for the rest 
of the time the series is being maintained. As was true of the 
results shown in the previous tables, this carbohydrate was 
less favorable as a substrate than any of the other polysac- 
charides employed. 
TABLE VII 
THE ACTION OF A “DIFFUSION-EXTRACT”’ FROM AIR-DRIED RHODYMENIA 
TISSUE UPON VARIOUS CARBOHYDRATES 
Sugar as glucose in 5 cc. 
Substrate mgms. 
15 days 45 days 75 days 100 days 
Starchey eerie eerie: 9.2 LZ 2, 14.8 18.2 
Dextringea. se ny eas 8.25 9.7 10.3 ial oa 
Glycogen seat. saci srariee: Trace 6.1 6.4 Onl 
aminarine seer ee. 4.7 les 9.6 10.5 
Manlineercn ee arene Sa eits Shon Trace Trace 
SUCKOSC Hy. sac roti s Trace Trace Trace 
ACTOS te Retiree ae Giese ; ab Trace 
IMaltose sso sn aoe oer Trace Trace 
THE CARBOHYDRASES OF AGARDHIELLA TENERA 
The very succulent nature of the freshly collected material 
compelled its partial dehydration immediately. Two 15- 
minute treatments with 95 per cent alcohol were used, then 
the tissue spread out on paper toweling to dry at room tem- 
perature. After drying, it was very easily powdered without 
the aid of quartz sand. The alcohol precipitate from a water 
extract of this powder was quite fine and flocculent, differing 
much from that of Rhodymema, both in amount and in nature. 
TABLE VIII 
THE ACTION OF A “DIFFUSION-EXTRACT” FROM DEHYDRATED AGARDHIELLA 
TISSUE UPON CERTAIN CARBOHYDRATES 
Sugar as glucose in 5 cc. 
Substrate mgms. 
15 days 45 days 75 days 100 days 
Starchie mer ove cheese 6.35 9.4 14.5 20.9 
DExtrinteee tee 7.00 10.5 15.95 19.7 
@lycogenterscansn steer 2.35 6.15 6.65 6.85 
Laminarin..... Arcee 5.8 8.3 11.6 Si, 
IGRYCh Eas (tae eee oe ee renenes Le Trace Trace Trace 
SIICKOSCEP ENE ern erase Trace Trace Trace Trace 
LEA GLOSE MS iens eects aoe Trace 
