
110 LIVERPOOL BIOLOGICAL SOCIETY. 
and the time they occupy in reaching the lock at a depth 
even of eighty fathoms (the greatest at which I have 
experimented) is undesirably long, and if the net were 
used in really deep water would be a serious matter. 
I have, however, never found that they failed to actuate 
the levers in the lock. 
Both these disadvantages can, I think, best be remedied 
by adapting to this tow-net the electrical apparatus which 
Professor Chrystal has applied with such success to the 
reversing of deep sea thermometers, and I hope to be able 
to carry out this plan during the coming summer. The 
apparatus required will be somewhat expensive, but no 
attachment of obstacles to the line will check the current 
and its action will be instantaneous. . 
In conclusion, I have to express my thanks to all atte 
from whom I have received assistance during the con- 
ducting of experiments and devising apparatus:—To Mr. 
John Murray, for the use of the yacht ‘‘ Medusa,” and 
to Mr. Alexander Turbyne, for his willing and skilful 
co-operation in the numerous, often futile trials. To 
Messrs. Jas. Duff and Sons, of Greenock, for their care 
and attention in constructing the net-frame and the first 
form of lock for preliminary operations. To my friend, 
Mr. Leonard Massey, for his invaluable assistance in 
designing the improved lock here described, and to Messrs. 
B. and 8. Massey, for constructing the same. 



