Physiology of Regeneration 627 
TABLE XIX 
Digitalin I : 10,000,000 
August 30 to September 13 (1907) 
NUMBER OF SEGMENTS 
Old Regenerated Old | Regenerated 
13 4 16 7 
16 4 17 7 : 
17 4 17 7 
18 5 17 7 
20 5 17 7 
16 6 19 7 
16 6 16 | 8 
17 6 16 8 
18 6 17 8 
16 7 | 17 8 
17 7 | 17 8 
18 7 
19 7 | Average 
| 17 6.5 
The experiments with digitalin were repeated in 1908 and 
many different strengths were tested. It was found impossible 
to keep worms alive for any length of time in digitalin even of 
such a weak concentration as 1 : 800,000. In Tables XX and 
XXI are brought together the data of experiments with digitalin 
both weaker and stronger than the weaker solution employed in 
1907. 
TABLE XX 
AUGUST 2I-AUGUST 31 (1908) NUMBER OF SEGMENTS AVERAGE 
Digital 6 Ne 15 | 15 SRS) LG ery en, | 20 | 15 | 16 16.1 
t PEIIUOO,OG0l), ¢)ces/02'- 50.6 
eos bene Mew: | died eat ails 3] 3 4| 4| 3-2 
TABLE XXI 
SEP. 3-SEP. 13 (1908) NUMBER OF SEGMENTS AVERAGE 
oi See = ae ae 
Digitalin f Old 1915119192415 1616 61718161718 201617 1718181617 19 17.2 
I : 3,200,000 | New 3333 3 3 4| 4) 4 4 4) 4) 4 4) 4 45 5 5 5} 5, § 6 6 64.2 
el Vai | 
