MARINE BIOLOGICAL STATION ON PUFFIN ISLAND. 61 
animals collected, nor any comparison between the con- 
tents of illuminated and ordinary tow-nets worked at the 
same time. 
The next submarine electric light experiments were 
those carried out by the L.M.B.C. in May, 1888, on board 
the “‘ Hyena,” as detailed in last year’s Report.* Justa 
month later in that same summer (24th to 26th June, 
1888) Prince Albert of Monacot used on board his yacht 
‘* Hirondelle,” a tow-net lit by a small Edison incandescent 
lamp (12 volts), supplied by a single Bunsen cell in which 
the nitric acid was replaced by chromic acid. The battery, 
which is let down into the sea along with the net, 
is hermetically sealed up in an iron case, while when 
the apparatus is used in great depths, the pressure is 
ingeniously equalised by a tube connecting the interior of 
the case with a strong indiarubber ball filled with air. 
This apparatus was tried in the neighbourhood of the 
Azores down to a depth of about twenty fathoms. 
It may be useful to state here that the ‘‘Hyena”’ is 
fitted up with the following electric light installation { :— 
A Gwynne vertical engine, of six nominal horse-power, 
running at 300-400 revolutions per minute, works a Phoenix 
compound-wound dynamo, with an effective output of 
5,980 Watts (65 volts, 92 amperes) at 1,000 revolutions 
per minute. There are two Pilsen are lamps of 3,000 
nominal candle-power each, which can be used on deck or 
at mast head, or on the side of the ship; four Edison-Swan 
submarine incandescent lamps of 100 candle-power, and 
ten of sixteen candle-power each. The dynamo, being 
compounded, allows the arc and incandescent lamps to be 
* And in Nature, vol. xxxiii., June 7, 1888. 
+ Comptes-vendus, t. evii., July 9, 1888. 
+1 am indebted to Captain F. Young of the Liverpool Salvage Association 
for this information in regard to the plant on board the ‘‘ Hyena.” 
