4 
veyance to market; just as much as the culture of corn is 
understood to mean not merely the sowing, but every step 
from the preparation of the seed bed to the marketing of 
the harvest. 
The acclimatization of freshwater fish I will consider 
with special reference to the Salmonidae, and attempt to 
foreshadow the results of the importation of some of the 
best known foreign species. 
ARTIFICIAL PROPAGATION. 
The artificial propagation of the Salmonidae is still in its 
infancy, but the bearing it has on their cultivation in the 
future is so important, I propose to commence this paper 
with a short description of the process, and explanation of 
the principles which are involved in the selection of a site 
for, and in the erection of, a hatchery. 
THE HATCHERY. 
The most important requisite for the hatching house is 
pure water; it is indeed to a hatchery what coal is to a 
steam-engine, all hatching apparatus of whatever kind 
being merely mechanical devices for extracting and trans- 
ferring from it the greatest amount of energy to the ova. 
WATER. 
Water in its natural state is frequently unsuitable for the 
earlier processes in fish culture. It is subject to great 
variations of temperature; it is rendered muddy by rain, 
and occasionally it is impregnated with lime or mineral to 
a fatal extent. Water in Great Britain, taken from a 
natural river even but a few miles from its source, is 
generally so contaminated with pollutions resulting from 
