28 
it seeks the highest parts of the roof; whence it 
happens that the rustic pigeon sespecially seek for 
towers, to which they may at their own pleasure fly 
from the fields and return thither. The second kind 
of pigeons is more quiet ; and contented with the food 
given it at home, it accustoms itself to feed within 
the limits of the gate. This kind is of a white 
colour principally, but the country sort is without 
white or variegated colours. From these two origi- 
nal stocks, a third mixed or mongrel kind is bred 
for the sake of the produce.” (page 151.) Thestay- 
at-home races should be avoided in hard feeding 
grounds, and the stock established should be some 
of those Mediterranean birds, which the Yarmouth 
sailors take with them in their Russian voyages.— 
They should be Russians with all the adhesive cou- 
rage of Russians. 
On looking at an ordinary osseous fish, there is a 
relation between the several fins, which we are sure 
to notice. It is that there are two of these organs 
that go in pairs, while all the others are single.— 
The pairs, the pectoral and ventral fins, represent 
the anterior and posterior organs of support and . 
progression in the higher series of vertebrate ani- 
mals, gut the other accessory fins are additional ap- 
pendages represented by no rudimentary members 
in higher structures. 
The ventral fins, though not constant in all fishes, 
represent the hinder extremities of mammalia, as 
much as the pectoral represent the arms and hanégs. 
“ The relative magnitude of the arms of fishes, and 
their constancy, compared with the posterior mem- 
