SEA-FISHERIES LABORATORY. 325 
Kiel, and was towed behind the ship, at a rate 
of about 8 knots, whenever we made a run of 
five miles or so without stop. On each such occasion 
the piece of No. 20 silk from the “ Réhre ” was plunged 
direct into a small bottle of formol solution, and the catch 
was obtained from it afterwards. The opening of the 
Roéhre by which water enters is only 1 cm. in diameter, 
the length of the brass tube is about 25 cm., and the silk- 
covered wider opening 1s 3°5 cm. in diameter.* The results 
of the nine hauls, for at least the leading groups of 
organisms, are given in the table, and the most note- 
worthy feature is the comparative uniformity both in total 
catch and in the numbers of most of the organisms. 
60.—_Priankxtron-Ro6uRE Carcues. 
Copepoda. 
Total imo nls ps eee et | Oiko- 
Date. Catch. |Diatoms.| ellates. | pleura. 
nauplii. Juv. adult. 
| | 
Aug. 21...| 0-2 175 1,400 1,425 | ae FRG -— 
eee...) Oz 100 1,945 1,500 100 423 40 
Seeaae.|') Onl 25 | 1,400 750 50 101 9 
mesos. | O-2 — | 250 1,000 125 128 5 
Pee.) Or? — 1,125 1,780 200 158 zt 
esl Oz 100 | 225 550 100 132 60 
Sept. 12...) 0-05 | 38 | 90 188 112 59 a 
Peeto.c |p. Or) 175 | 200 425 50 130 2 
Peees..<| O-l 38 313 375 112 102 I 
—— — See a 
CONCLUSIONS. 
This section may be brief. It is unnecessary to 
repeat at any length what was given in Part I. last year, 
and there is a good deal of detailed analysis that we prefer 
to retain for a further Part when we have additional 
evidence and another year’s experience of the work. We 
*For description and figure, see Dakin, ‘‘ Methods of Plankton 
research,” Trans., Liverpool Biol, Soc., Vol, XXII, p. 538. 
