620 Sergius Morgulis 
Experiments with Chloretone 
Chloretone has been made much use of within recent years to 
stupefy or simply to quiet animals. ‘The addition of a few drops 
of a weak solution of chloretone to the water in which an animal 
is kept is often sufficient to slacken its movements. It seemed 
desirable to investigate the effect that chloretone would produce 
upon a regenerating animal. A 0.001 per cent solution of chlore- 
tone in sea-water was employed in this experiment. ‘The regener- 
ating worms were submerged in the solution for one-third of 
the entire duration of the experiment. ‘The effect of this treat- 
ment will be easily observed by examining Table XII. 
TABLE XII 
Chloretone 0.001 per cent 
Fuly 26-August 10 (1907) 
NUMBER OF SEGMENTS 
- 
Removed Old - BESS) Removed Old } EEERES | Removed Old pase 
ated | ated | ated 
28 20 3 | 21 rae 4 20 16 6 
19 17 3 | 20 17 4 19 19 6 
23 17 3 20 17 4 23 16 7 
23 15 cael ee) TOm 4 22°) || "a6 7 
a7 15 3 | 23 — | 4 21 417 7 
21 18 3 | 22 17 4 18 16 7 
22 16 3 19 17 & 24 17 7 
23 16 3 19 15 5 20) 1) siaie 7 
19 18 3 21 19 5 22 18 7 
21 17 4 18 14 | 5 21 17 7 
18 20 A 22 19 | 5 15 ¥6 8 
26 14 4 21 17 6 21 | ake 8 
24 17 4 18 14 | 6 
8 ae) Ce) | ab) i | 6 Averages 
19 15 4 23 14 | 6 20.9 | 16.7 5 
Ratio of new and old segments, 30 p. c. 
The number of removed and old segments in this experiment 
differs immaterially from those of the control (see Table I, 4). 
On the contrary the average number of regenerated segments 
