64 NOTES ON 
the new arms were nearly of the same size as 
the others, and in less than a week each polype 
had a young one shooting from it. 
The most curious circumstance connected 
with this experiment was, that the two new 
polype had each ten arms, while that from 
which they were produced, as well as those 
that were in the same vessel, had only six or 
seven. 
It may not be inapposite to append here a 
few remarks on the proper method of preserving 
polypi. 
They thrive best in a large vessel. A glass 
cylindrical jar, holding about three quarts, will 
answer the purpose very well; I have kept 
them for several months in a vessel of this 
description. 
Although they do not seem to possess any 
visual organs, yet they appear sensible to light, 
and prefer that side which is most illuminated. 
A fresh supply of water must be given them 
occasionally. If it cannot be procured from 
the pond from which they were taken, river- 
water should be substituted, always keeping a 
small quantity of live vegetation with them. 
