28 
Unusual specimens, or anything not recognised 
should always be preserved for examination in 
the Liverpool Laboratory. 
II.—‘* Plankton” cor Tow-Net/ Collections. 
* Tow-nettings should be taken along with every drag 
of the fish trawl. One haul with a bottom and one with 
a surface net should be made on each occasion. The 
collections should be at once preserved in formaline 
solution, and sent to the Liverpool Laboratory as soon as 
convenient after landing. Extra tow-nettings should be 
taken as frequently as possible. Al such observations 
on the floating life of the sea (which includes the eggs 
and the microscopic food of many fishes) are most useful. 
Even short hauls of ‘half-an-hour’s duration, taken twice 
a week, will probably suttice to give a fairly accurate idea 
of the movements of the Plankton in the District. 
TII.—Physical Observations. 
(a) Spa Temperatures.—Surface and bottom obser- 
vations should be taken at the beginning and 
end of each drag. Bottom temperatures 
should be taken with a reversing thermometer. 
(6) Sprciric GRAVITY OF THE SEA WateR.—NSurface 
and bottom observations should be taken at 
the beginning and end of each drag. Bottom 
observations should be made on samples of the 
bottom water, taken with a Mill’s bottle. 
“(¢) Arr TrmMprraturE.—One observation at the 
beginning of each drag should be taken for 
comparison with the sea temperature. 
‘“(d) Bsrometric PressurE.—One observation taken 
at the beginning of each drag is sufficient. 
‘* (e) TRANSPARENCY OF THE SEA Water.—One obser- 
vation should be taken at the beginning of 
