Physiology of Regeneration 623 
will be seen that the 0.001 per cent solution of atropine sulphate 
(1 : 100,000) lowered the regenerative capacity IO per cent 
(36.3 to 26.5). 
TABLE XIV 
Control (For experiments recorded in Tables XV, XVI, XVIII and XIX) 
August 28 to September 11 (1907) 
NUMBER OF SEGMENTS 
Old Regenerated Old Regenerated | Old Regenerated 
18 2 17 6 19 7 
18 4 17 6 15 vi 
15 4 17 6 16 7 
19 4 20 6 15 7 
15 4 15 6 13 8 
18 4 16 6 16 8 
17 5 18 6 17 8 
18 5 14 6 14 8 
19 5 16 6 16 | 8 
14 5 17 7 | 16 | 8 
15 5 17 7 17 78 
15 5 19 7 17 8 
17 5 19 7 19 8 
ae 5 17 7 
16 5 19 7 Average 
-18 5 19 7 | 16.8 6.1 
Ratio of new to old segments, 36.3 p. c. 
In the course of the first few days there was hardly any differ- 
ence between control and experimented worms. ‘The difference, 
however, became quite noticeable at the end of the first week. 
This is especially true of the worms treated with 0.001 per cent 
of atropine, in which the “Anlagen”’ of parapodia fail to develop 
for some time, and the segments already formed are poorly 
differentiated from one another. Even at the end of two weeks 
the depressing effect of the solution could still be easily observed 
in the diminished growth of the parapodia and of the regenerated 
tail as a whole, as compared with those parts in worms regenerat- 
ing under normal conditions. 
