491 
] 902-3.] Dr Noel Paton on October Salmon in the Sea. 
Table YII. — Weight of Ovaries. 
No. 
Total. 
Percent. 
PerS. F. 
1 
■ 
517 
8-58 
857 
2 
710 
10-56 
1024 
4 
118 
2-18 
210 
6 
764 
17-01 
1126 
10 
1116 
20-28 
1883 
20 
237 
6-81 
623 
21 
640 
12-7 
1182 
22 
667 
11-2 
1105 
23 
462 
8-74 
823 
24 
700 
12-35 
1160 
25 
455 
7'43 
635 
26 
1192 
18-61 
1907 
The average percentage weight of the ovaries in Class 1 is 14 
per cent., which approaches the weight reached in the Tweed at 
Kelso between the 10th and 20th of October according to the 
investigations of Tosh. 
The difference between these fish and river fish at tlie same 
season is not marked, and indeed Nos. 10 and 26 appeared 
almost ripe for spawning. 
The average percentage weight of the ovaries of the Second 
Class is 7 '9, say 8 per cent., a weight reached by Tweed fish in the 
end of September. 
Taking 15 to 16 per cent, of the weight of the fish as the 
average weight of the ovaries of fish entering the river in October 
and November, as shown by Tosh’s figures, it will be seen that the 
fish in this class are distinctly behind those of the first class. 
But since in both the Tweed and Rhine fish the increase in the 
weight of the ovaries from 8 to 1 3 per cent, takes place in ten 
days, in all probability the fish in the Second Class would spawn 
very shortly after those in the First. 
Calculating the weight of the ovaries as for fish of standard 
length, the average of these two classes is 1340 grm., which 
corresponds closely to the 1439 grm. which we found as the 
average of our previous observations of estuary fish in October and 
November. 
The single fish in Class 3 is of great interest. In it the ovaries 
