408 



DEPARTMENT OF THE NAVAL- SERVICE 



made in fathoms. These have been converted to round numbers in metres. No time 

 has been given for the tow hauls. The records are not complete in this respect. In 

 many of these hauls the net was towed by the drifting of the ship before the wind. 

 Sometimes it was part drift and part steam towing. The rate at which the net was 

 to\^ed varied within such wide limits that the time could not well be used for purposes 

 of comparison. This does not apply to the tows made by C.G.S. No. S3. The letter 

 "c*' (circa) before the depth indicates that the depth has been presumed only. 



With two exceptions all the hauls were made with a net having a mouth with a 

 diameter of one metre and made of silk bolting clpth with from fifteen to sixteen meshes 

 to the centimetre. Certain hauls made at Princess stations 1 and 2 were made with a 

 net of finer mesh (gear 20). 



When two hauls were made at the same depth at the same station, these have been 

 distinguished by the Eoman numerals I and II. 



The plankton was measured after settling in the bottles in which it was preserved. 

 Similar bottles were graduated and the amount of plankton determined by comparing 

 the bottle containing the plankton with the graduated bottle of the same kind. This 

 was a quick but rough method of determining the amount. 



The measurements confirm the observations made during the cruises that: (1) 

 there is more plankton in colder water, (2) there is more plankton where the water is 

 deeper, and (3) the plankton as a whole is at a deeper level during the day. 



PLANKTON.— HAULS AND QUANTITY. 

 C. G. S. "Acadia." 



No. 



of 



Station . 



10 



Date. 



May 29. 



May 29. 



May 29. 



May 30. 



May 30. 



May 30. 



May 30. 



May 30. 



May 30. 



Hour. 



11.05a.m.-12.0.5p.m. 

 2.30-4..30 p.m 



7.30 p. m 



1.00-2..30a.m 



5.30-6.30 a.m 



10.15-11.15 a. m 



12. .55 p.m 



5.00-6.00 p.m 



7.15-9.00 p.m 



Depth 



(metres). 



60 



99-144 



171 



45 



108 

 £0 



104 



732 



Depth of Haul (metres). 



50- 25 

 20- 

 100- 50 

 30- 







150-100 



80- 40 



30- 



60- 





 40- 









 50(?)- 





 25- 











(vert, elos.) 



(vert.) 



(vert, clos.) 



(vert.) 



(tow) 



(vert, elos.) 

 (vert, clos.) 



(vert.) 



(vert.) 



(tow) 



(vert.) 



(tow) 



(tow) 



(vert.) 



(tow) 



(vert.) 



(tow) 



(tow) 



Quantity 



(in c.c.) 



15 



2 



35 



10 



30 



70 



15 



25 



25 



170 



35 



35 



5 



5 



25 



5 



20 



800 



