BULLETIN OF THE UNITED STATES FISH COMMISSION. 117 
the Ming pipe. The length is about 7 millimeters [| inch]. The in- 
testine has begun to form a bend. The ground color is more yellow- 
ish. Temperature, 8° E. [50° F.]; specific gravity of water, 1.021. 
May 18. — Cloudy and rain. Saw a number of cod fry of 8 millimeters 
length. 
May 20. — Clear weather ; fry all over the basin. 
May 21. — Towards the evening, they gather to the west side of the 
basin. Length of fry, 10 millimeters. 
Places of taking temperature, &c. 
Temperature. 
Specific 
gravity. 
At- overflow 
10 
°F. 
54. 5 
1. 0227 
At 1 meter depth . .............. 
10 
.54.5 
53. 8 
1. 0227 
At 2 meters depth 
9.7 
1. 0227 
A t, 3 met, era depth 
0. 5 
53.4 
1. 0227 
At bottom 
9.5 
53.4 
1. 0230 
May 23. — The fry prefer to keep themselves in the shade, conse 
quently they are at the east side in the morning and west side in the 
evening. The difference in the size is considerable, but the develop- 
ment is nearly the same. The distinction between the different kinds 
has already commenced to be noticeable. 
May 31. — From last date the weather has been cold and rainy and 
observations insufficient. To-day are seen a great number of them. 
Caught one 15 millimeters long [a little over J inch]. They still like 
the shade. 
June 1. — Saw a young flat-fish among the cod, all in the shade. 
June 3. — It is a month to-day since they were put into the basin. 
Caught and preserved 50 of them in spirits of wine. They are now 
from 9 to 16 millimeters long. The smaller do not seem to have the 
same degree of development as the larger. 
June 6. — Temperature in the basin 12 J° E. [60° F.] ; temperature in 
overflow, 10£° E. [55J F.]; temperature in filling pipe. 6° E. [45J F.]. 
That the water was so much colder in the filling pipe was because it 
was pumped from a greater depth. The fry are growing and are found 
over the whole basin. Tried to feed them to-day with fine- cut mussels 
and fish, etc., but it was no use ; they fled in great haste'from it. 
June 8. — During the last days they seem to have disappeared in great 
numbers from the upper part of the basin, and keep closer towards the 
bottom. Caught one at two fathoms of water. 
June 10. — After carefully studying the life and habits of the cod fry 
from early morning and during the whole day (a clear, calm, and sunny 
day), I have found that they attack, kill, and eat each other in consid- 
erable numbers, whereas the crab larvae (now both in the zoea and meg- 
alops stage) were seldom pursued, and, as far as I could see, were never 
caught by the young cod ; not that they seemed to lack the desire to 
catch them, but the larvae are such splendid swimmers, and understand 
