50 Proceedings of Royal Society of Edinburgh. [sess. 
Comparison of the results of the present investigation with those 
recorded in the previous Report tend to show that the male fish 
leaving the sea from January to August have all about the same 
amount of solids in their muscles and have testes little developed. 
Table VI . — Showing Solids of Muscles and Testes of Male 
Salmon leaving the Sea. 
Jan. 
March. 
May and 
June. 
July and 
Aug. 
Oct. and 
Nov. 
Muscles, 
2254 
2151 
2004 
2345 
1470 
Testes, . 
2-6 
1-9 
2-6 
3-9 
66 
2256*6 
2152*9 
2006-6 
2348-9 
1536 
The slightly lower figure in May and June is due to the fact 
that the two fish examined in 1896 were much below the average 
as regards muscular development. 
The two fish examined in October and November show a very 
small amount of solids in the muscles. The average figure for 
the total solids from January to August — 2191 grms. — is based on 
the examination of 11 fish, and the divergence from this mani- 
fested in these two fish must be accepted with caution, and does 
not justify the formation of any conclusions. Further data are 
required. 
From the table given above it will be seen that the male salmon 
coming from the sea closely resemble the female fish in the amount 
of nourishment stored in the body. 
Amount of solids in muscles and, genitals in salmon leaving the 
sea from January to August : 
Female Fish, 2434 
Male Fish, 2191 
In fact, the more extended examination of these male fish from 
the estuaries, further bears out the conclusion, arrived at from the 
examination of female fish, as to the factors determining migration. 
