724 
ME. G. J. ROMANES ON THE LOCOMOTOR SYSTEM OE MEDUSJL 
Normal water 
Six seconds after transferrence to chloroform . 
Six seconds later 
Six seconds later 
Six seconds later 
Six seconds later 
One second 
Fig. 15. 
In such experiments, the recovery of the normal rate in unpoisoned water is gradual. 
Taking, for instance, the case of a spiral strip in morphia: — 
Fig. 16. 
In normal water 
Quarter of an hour after exposure to morphia 
One minute after strengthening dose 
Four minutes later, and just before blocking of wave 
Fifteen seconds later, wave continuing blocked 
Immediately after passage of wave on restoration to normal sea-’ 
Four minutes later 
Quarter of an hour later 
An hour later 
One second 
From this it will be seen that the original rate did not fully return. Some substances, 
however, exert a more marked permanent effect of this kind than do weak solutions of 
morphia. Here, for instance, is an experiment with alcohol : — 
Fig. 17. 
In normal water 
Quarter of an hour after exposure to weak dose 
Two minutes after strengthening of dose 
Five minutes later, and just before blocking of wave 
Fifteen seconds later, wave continuing blocked 
Immediately after passage of wave on restoration to normal sea-wate] 
An hour later 
One second 
(h) From these experiments, however, it must not be definitely concluded that it is 
the ansesthesiating property of such substances which exerts this slowing and blocking 
influence on contractile waves ; for I find that almost any foreign substance, whether 
