1912) Ritter: The Marine Biological Station of San Diego 187 
5:06 A.M. 26 5:36 aM. 14.5 6:10 am. 9.0 
0:08 a.M. 24.5 5:38 AM. 14.5 6:18 am. 9.0 
5:10 a.M. 24.5 5:40 aM. 14.5 6:20 a.m. 8.5 
5:12 aM. 22.5 5:42 am. 14.0 6:28 A.M. 8.5 
5:14 am. 22.5 5:44 am. 15.5 6:30 A.M. 8.0 
5:16 a.m. 21.0 5:46 am. 13.5 7:02 AM. 7.5 
5:18 a.M. 21.5 Floating clouds. 5:48 AM. 15.0 7:12 am. 6.0 
5:20 a.M. 21.0 5:50 A.M. 13.5 7:18 aM. 6.0 
5:22 am. 19.5 2aM. 12.5 7:25 AM. 6.5 
5 AM. 21.0 5:54 aM. 12.5 7:50 am. 6.0 
5 A.M. 18.5 6:00 a.m. 11.5 7:58 am. 6.0 
5:28 am. 17.0 6:02 a.m. 10.0 8:10 a.m. 5.0 
5:30 AM. 17.5 6:04 a.m. 10.0 
After 8:10 the light was too bright to detect its intensity with the photo- 
meter. 
6. HANDLING THE APPARATUS 
(a) The Surface Nets. When according to the judgment of 
the scientist in charge the surface nets should be used he calls: 
“Surface nets out,’’ and two sailors detailed for this service put 
them over. The large 000 net is fastened to the end of a heavy 
rope about two hundred feet long, and to its rim is attached an 
air-tight five-gallon can or carboy to serve as a float. The net 
is then thrown over the rail at either side of the boat’s stern, 
depending upon the direction of the drift. At a distance of 
about fifteen feet from the 000 net the next smaller net, mesh 
no. 9, 10 or 12 as the ease may be, is attached to the rope, and 
about fifteen feet from that one the third net, usually mesh no. 
20, is likewise attached. The nets are then allowed to drift until 
the rope becomes taut, when it is made secure. After the nets 
have been out long enough the scientist calls ‘‘ Surface nets in”’ 
and the sailors haul them in, detach the two smaller ones and 
lift the large one on deck. The nets are then washed with surface 
water to prevent any of the organisms from adhering to the net- 
ting and the contents of the bucket are transferred to containers 
which consist of pint or quart sure-seal fruit jars, or if the 
catch is unusually large, into pails. About five minutes are con- 
sumed in hauling in, detaching and washing the nets, trans- 
ferring the catch and putting the nets out again. 
(b) The Nansen Net. To operate this net requires the com- 
bined labor of an engineer, a man to read the meter, another to 
