RESULTS OF SALMON MARKING 59 
now oxidised, so as to render them less conspicuous 
to other fish. 
Four reports on the Scottish results have now 
been published (20th, 22nd, 24th, and 25th Re- 
ports, Part IL), and the records of over three 
hundred recaptures discussed. In Ireland two 
reports have appeared (Report for 1901, Part IL, 
and Fisheries, Ireland, Sci. Invest., 1904, VII. 
[1906]), and in England one short report has been 
published (Agric. and Fisheries for 1905, Salmon 
Acts, &c.). We have now, therefore, got a con- 
siderable number of records with which we can 
deal respecting the movements and increase of 
weight and length of the salmon of our country, 
and when we combine the results from the separate 
countries we are in a position to view the salmon’s 
life with some breadth of horizon. 
The most outstanding feature is the demonstration 
of what has been called the divided migration of 
the salmon—the habit of the fish to remain short 
periods and long periodsin the sea. A shrewd fore- 
cast of this dual habit as seen amongst Tay fish was 
made by Mr. John Dickson, for many years agent 
for the Tay Fishery Proprietors, and who wrote on 
divided migration of the salmon as early as 1860 
in the Perthshire Courier, and who has ever since 
continued to assert that this habit when properly 
understood will be found to completely explain the 
presencé of early and of late fish in Scottish rivers. 
Tt has always been sufiiciently clear to the observant 
that all salmon are not annual spawners. The mere 
fact that when fish are spawning, and when spent 
