Flow to obtain itt. 277 
of growing trout in such situations that they have access to salt 
water. 
In most trout there exists a tendency to diverge from the 
original type, and yet on the other hand we find in very marked 
and apparently distinct races, a considerable disposition to revert 
again to the original type. This reversion to type is very marked 
in the case of some birds and animals which have already been 
referred to. In the trout it is so marked that the question as to 
how many species we actually possess comes in and claims 
our serious attention. We find that fresh-water forms become 
anadromous, and also the reverse, viz., that sea-going forms be- 
come land-locked, and that the most marked races exhibit strong 
symptoms of reversion to original type, and all these facts lead us 
to one point, and that is a common ancestry. Here we must 
leave this deeply-interesting question. Future investigations will 
no doubt throw a good deal of light on so important a subject. 
In a few more years we shall know how trout behave themselves 
in other parts of the world, as for instance, in South Africa and 
the island of Ceylon. Already a commencement has been made 
in both these latitudes, and we are hoping soon to be able to 
report some results. ‘Trout’ are introduced, and the future will 
possibly develop some new and important facts concerning them. 
We know that, by judicious selection and inter-breeding, races 
are improved and desirable varieties perpetuated, and we know 
also how easy it is to lose the thread, as it were, of a pedigree 
race by a little careless manipulation of the breeding stock. 
There is endless scope for selection and improvement, the making 
of cross-breeds, and of hybrids, and investigating the life histories 
of some of the sterile forms that are occasionally met with in 
Nature, and which are also easily produced by artificial means. 
Trout do not necessarily deposit ova every year. Asa rule 
they do, but a few do not, that is to say, a trout occasionally 
misses a year. There does not seem to be any hard and fast rule 
by any means. Probably trout ought naturally to spawn every 
year, but a fish which has been sickly or ill-fed, or that has got 
injured in some way or other, proves an exception to the rule. 
Broken fins unite again, and those that have been lost are 
sometimes reproduced, but they always show traces of having 
