Poa Gis 
Fisu and their ways have at all times engaged the attention of the 
writer, and the outcome of these studies has been the production 
of this volume. Within its pages he has endeavoured to clear up 
many points relative to the history of salmon and trout which have 
until lately remained a mystery. So many unsatisfactory theories 
have been advanced, that he determined to take full advantage of 
his position as Manager of the Tay Salmon Fisheries Co., Ltd., and 
do all in his power to investigate and further our knowledge regard- 
ing this most interesting branch of Natural History. With this end 
in view, the marking of smolts on their way to the sea, and their 
recapture afterwards, have been extensively carried on, and their 
weight, date of capture, and the particular run to which they be- 
longed, have been carefully recorded. 
Hitherto it was believed that salmon smolts returned as grilse 
the same year as they went down to the sea, but a study of the smolt 
does not bear this out. Again, the writer shows that the large 
Spring salmon, the small Spring salmon, and also the ‘“ Summer 
Run,” are on their first return from the sea, and not from the kelt 
grilse as many supposed. Evidence is also given that the so-called 
salmon bull-trout is not a trout, but a true salmon which has spawned, 
and consequently has become altered in appearance and white in the 
flesh. From a study of the scales the age of a fish can be arrived 
Vv 
