626 Sergius Morgulis 
Experiments with Digitalin 
Digitalin is highly poisonous and can be used only in exceed - 
ingly attenuated solutions. I tested the influence of a 0.0001 per 
cent (I : 1,000,000) and 0.00001 per cent (I : 10,000,000) solution 
of digitalin on the rate of regeneration. 
The data from this experiment are contained in Tables XVIII 
and XIX. 
TABLE XVIII 
Digitalin I : 1,000,000 
August 29 to September 12 (1907) 
NUMBER OF SEGMENTS 
Old | Regenerated 
18 3 
15 4 
19 4 
18 4 
17 4 
17 4 
17 4 
14 5 
16 5 
6 
18 
Average 16.9 | 4-3 
Relation of new to old segments 
in percent, 25.5 
From these tables it may be seen that the worms subjected 
to the action of the 0.0001 per cent solution of digitalin (1 : 1,000,- 
000) regenerated on the average 4.3 segments (3 to 6 segments), 
and that the relation between the new and the old segments is 
25.5 per cent. This of course indicates a decrease in the regen- 
erative capacity as compared with the control (Table XIV, p. 623). 
The weaker solution of digitalin (1 : 10,000,000) produced no 
effect upon the regenerating worms, and the regeneration was 
normal. 
