180 On the BelationsMp existing [no. 4, new series, 
the various secretions, as they disclose no appreciable disparity in 
structure to account for the dissimilarity of their products, must 
therefore possess some special endowment or quality, whereby they 
are enabled to make a selection of material. The mode in which 
the gland as a whole is constructed can have no direct influence 
in this respect, for secretions are vicariou/ij and the same gland as- 
sumes different forms in different grades of the animal kingdom. 
We have not space to compare the secretions of the two kingdoms, 
and would merely insist on the simihrity of secreting structures 
in both, and the mysterious faculty that these possess of selecting 
certain substances, and only these during health, from the circulat- 
ing fluid. 
Thus through all the functions of organic life, there exists 
between the animal and plant a wonderful consanguinity. In 
both we find a variety of processes instituted with a view to the 
same results, and performed by means of structures identical in 
the plan of their conformation. There are still however other re- 
lations, equally strange, existing between the two kingdoms ; and 
these are perhaps more directly practical in their bearings than 
those already noticed. The great Creator of the universe, has es- 
tablished a fixed Geographical distribution of the varieties of the 
animal and plant, that cannot be departed from without incurring 
the risk of disease or even death. The Esquimaux enjoys perfect 
health, living in his snow-hut and feeding upon raw flesh, the sup- 
ply of whi<;h is far from regular or abundant; a mode of life that 
would, to say the least of it, be dangerous to any native of a tem- 
perate climate, and death to any member of an intertropical race. 
On the same inhospitable shores of the frigid zone, we find a scan- 
ty flora of Saxifragacese, Salices and Cochlearise, not one of which 
has ever been removed to a milder climate with impunity. Still 
more impossible would it be to transplant and to adorn with our Mag- 
nolias, Camelliesc or Palmse, the ice-bound coasts of Labrador or 
Greenland'; or to exchange for the Lion and Tiger of the one re- 
gion, the fiercer and more powerful White Bear of the other. 
Early in the summer of 1852, a dog and bitch only a few months 
old were picked up by me on the shores of Melville Bay in about 
75° N. Latitude, Both were in good health so long as we remain- 
