Phystology of Regeneration 625 
The experiments with atropine were repeated in 1908. The 
atropine sulphate was then used in three different concentrations 
of 1, 3and 10 parts to 200,000 parts of sea-water (sco0> soo and =}$5 
per cent). The results are shown in Table XVII. 
TABLE XVII 
Atropine 
August 13 to August 23 (1908) 
ATROPINE | ATROPINE ATROPINE 
CONTROL 
I 2 200,000 | 3, 3 200,000 | IO : 200,000 
| Regener- Regener- | Regener- | Regener- 
a ated a ated Le a | ated | Old ated 
Sas Segments Bees | Segments | Sa tae | Segments | Septients Segments 
18 3 13 3 14 3 4 3 
14 “4 17 3 17 3 15 3 
15 4 17 3 18 3 17 3 
15 & 200 4 16 4 18 2 
15 5 LAD a teaee 16 + 15 4 
18 by TGR) 5 16 4 17 4 
| | 
19 5 TO oS 18 4 17 4 
17 6 17 5 17 5 | 18 4 
| 17 5 | 19 4 
18 5 21 4 
16 6 
17 6 
19 6 | 
Average numbers of segments 
16.4 | 4.6 | 16.7 | 4-7 | 16.5 | 7 mW eas | 3.6 
It will be seen from these data that the number of regenerated 
segments in the control (sea-water) and in the weakest concen- 
tration of the atropine varies from 3 to 6, but in the strong solu- 
tion (10 : 200,000) from 3 to 4. Comparing these data with 
those of the previous year, it will be found that in concentrations 
greater than I : 100,000 the atropine produces a retarding effect 
upon the rate of regeneration, while in weaker concentrations it 
is ineffective. 
