140 



BULLETIN OF THE UNITED STATES FISH COMMISSION. 



necessary reductions and a fuller discussion of the results, will appear in the forth- 

 coming bulletin of the Michigan Fish Commission: 



Schedule of the hauls of the vertical net. 



Date, 1893. 



Month. Day. 



IX 



in 



17 



Hour. 



11: 10 a. m 

 11:30 a. m. 

 11:45 a. in. 



1 : 15 p. in . 



1:30 p.m. 

 10:40 a. m. 

 11: 00 a. in. 

 11:15 a. in. 



11:30 a.m. 

 11:45 a. in. 



1 : 45 p. in . 

 2 : 00 p. in . 

 2 : 10 p. m . 



2 : 30 p. in . 

 10:30 a.m. 



10 :45 a. in 



11 :00 a. in. 

 11 :45 a. in. 



3:15p.m. 

 3 : 30 p. m . 

 4:00p.m. 

 4: 15]). in. 

 4 : 30 p. in . 



3 



-3 



lllq. 



Ill ... 

 III 2 . 



in 3 



III4 . 

 Yq.. 

 V . .. 

 V 2 ... 



V.... 



IX?.. 

 IX... 



1X2... 



IX 3 ... 



XIX q 

 XIX.. 



XIX 2 

 XIX 3 



XX... 



XX q 



XX 2 . 

 XX 3 . 



xxj.. 



Tempera- 

 ture of 

 water in de- 

 grees centi- 

 grade. 



Top. 



Bot- 

 tom. 



17.2 i 17.2 



18.2 



18.4 



18.1 



18.9 



17.9 



18.1 



18.1 



18. G 



- © 



4) © 



B 1 - 



a fcn 



H-3 



19.2 



19.8 

 19.8 



Wind. 



NE. 1 

 NE.1. 

 XE.l 

 NE.2 

 NE. 1 

 SE. 1. 

 SE.l. 

 SE. 1. 



25. 

 22.8 



SE.l. 

 SE.l. 



N.I.. 

 N.I.. 

 N.I.. 



17.7 



Sky. 



Cloudy 



...do 



...do 



Cloudy and sunny 

 ...do 



.do 



.do. 



.do 



.do 

 .do 



.do 



do 

 .do 



Water. 



Slight waves.. 



...do 



...do 



...do 



...do 



Moderate swell 



...do 



Swell and 

 waves. 



...do 



Not so rough 

 as V 3 . 



Slight waves. 



...do 



Moderate 

 waves. 



Slight waves. 



Rough 



....do 



....do 



....do 



Smooth 



...do 



....do 



....do 



....do 



t- 



a - 



a. 2 



O 

 to 



O 3 



■90 

 1-27 

 •80 

 ■98 

 •87 

 ■90 

 119 

 •83 



•63 

 •54 



•66 

 •62 

 •68 



•42 

 2 43 

 4-50 

 3-29 

 2-66 

 2-47 

 2-50 

 1-75 

 1-97 

 1-43 



The fourth column contains the arbitrary number given to each haul of the net. 

 The Roman numerals indicate the number of the station. Two hauls were always 

 made from the bottom; one of these, distinguished by the letter q, is intended to be 

 used for qualitative work, the other is indicated by the station number only. The 

 small Arabic numerals affixed to the remaining station numbers serve to indicate the 

 different hauls which do not reach the bottom, the number 2 indicating the haul made 

 from the greatest depth. The fifth column gives the depth of water and the sixth the 

 depth from which the net was hauled. When the net is hauled from the bottom the 

 depth from which it is hauled is reckoned from the top of the canvas cone. It equals 

 the depth of water minus the height of this cone. The remaining columns give the 

 temperature of air and water in degrees centigrade, the direction and strength of the 

 wind, and condition of the sky and water. The last column gives the volume taken. 



The same net was used for all the hauls, and if we assume that it was drawn in 

 each case with the same velocity, then the volumes taken in the different hauls may 



