AQUATIC LIFE 133 



variations in the readings the same man made all the observations 

 while the other rowed the boat. 



We usually started out at 9:30 a. m., and at each station the 

 following procedure was carried out. On arriving at the statioa 

 a heavy anchor was dropped to the bottom to hold the boat at a 

 fixed point. Then the form for keeping the data, previously 

 described, was filled out. The towings were made as follows: first 

 the tow net with vial attached was weighted and buoyed sufficiently 

 to eni£rse the net arid vial to the desired depth. This was attached 

 to a rope 100 feet long. The boat was then rowed 100 feet and then 

 anchored and the net with vial was gently pulled to the boat. 

 This gave us sample No. i, horizontal towing at the surface. The 

 cork was marked accordingly and inserted into the vial. A note of 

 vial was made in record book. Owing to the shallow water at some 

 of the stations only the one towing was taken but at other stations 

 where the depth of the water was greater, the surface, one half the 

 distance to the bottom and bottom towings were taken and marked 

 accordingly. The complete trip was generally finished at 3.00 p.m., 

 and the material brought to the laboratory for preserving. Four 

 drops of formaldehyde and two or three of glycerine to each vial 

 served as best preservative. The vials were placed on a special, 

 private table and were not molested. The examination of material 

 was made next day. 



FIELD NOTES 



CHART I 



Date.. ..6-29-16. Time. ..9:32 A. M. Sky.-.-Hazy. 

 Station No. I II III IV V VI VII VIII IX 



Cent. Temp, at Surface 27.5 27.5 29. 28. 28. 28.5 28. 27. 27. 

 yi. Dist. to Bottom 27.5 27. 29. 28. 28.5 28.5 28. 27. 27. 



Bottom 27.5 27. 28.5 28. 26. 28. 28. 26. 27. 



Depth i'9" 2'8" 2i'^" -' 5'8" i'4" i'9" 6*2" \' 2" 



Time a. m. 9:45 10:00 10:20 10:40 p.m. i 2 2:15 2:30 3 



Wind Direction N.W. S.W. S.W. S.W. S.W. S.W. S.E. S.E. S.E. 



Wind Velocity L.B. L.B. L.B. L.B. L.B. LB. L.B. S.B. S.B. 



Turbidity I'g" 2'8" 8' 2' \" 3'8" I'B" I'g" 3'i" i'2" 



Air Temperature 27 27 27 27 26 26 26 26 25 



CO2 Cont. No. c.c. perM. 30202100072 

 Vial No. Location 



I Horizontal Towing from station I. 



II Horizontal Towing from station II. 



III Horizontal Towing from station III. 



IVa Horizontal Towing at surface from station IV. 



IVb Horizontal Towing }4 D. to B. from station IV. 



