16 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
large researchers’ tank room, and two smaller tank rooms* 
at the far end, one for investigators in bio-chemistry or 
comparative physiology, and the other for embryological 
work. All three tank rooms have cemented floors and 
walls, and are well provided with concrete tanks of 
different depths, and with abundance of sea-water taps. 
In the large room, common to all workers, there is a 
deep concrete tank after the style of the lobster tank in 
the Hatchery, which will be suitable for keeping fishes 
or any large crustaceans and molluscs that are under 
investigation or require to be stored. Along the same 
wall there is also a range of three smaller shallow tanks. 
varying from six inches to a foot in depth, and about 
three feet square superficially. Hach of these is provided 
with a separate sea-water tap and waste-pipe, but they 
can, 1f necessary, be connected up in series if it 1s desired 
that the same water should run through any two or more. 
In each of the smaller rooms for physiology and 
embryology there are two similar shallow concrete tanks 
occupying the end wall. Both in the large room and in 
each smaller room in front of the windows there are 
concrete platforms, about three feet high, with cemented 
tops excavated to a depth of from two to four inches, 
which can be used either as sorting tables or as a series 
of very shallow tanks. They are abundantly supplied 
with sea-water taps, and have certain transverse parti- 
*Such a separate small experimental tank-room would be con- 
venient for two or three workers engaged on a joint investigation—such 
as the research undertaken in the spring of 1905 at Port Erin by Pro- 
fessor B. Moore, Dr. H. E. Roaf and Mr. Edward Whitley on the effect 
of treating Echinus eggs and early embryos with various dilute 
alkaline and acid solutions added to the sea-water (see this Report for 
1905, p. 28, and Proc. Roy. Soc., B., Vol. LX XVII., p. 102, 1906). The 
results obtained at that time by Professor Moore and his fellow-workers 
showed that the addition of small quantities of alkali increased the 
rate of cell-reproduction and caused the mitotic division to become 
irregular—results which have formed the starting point for some 
recent lines of investigation into the cause of cancer. 
