\ 
434 Domestication of the Grizely Bear. [ May, 
A graphic representation of these changes in connection with 
the curves of hydration, will enable us to determine the relation 
of growth and seasons to hydration of tissues: This comparison 
will show most conspicuously that that period at which growth 
for the season is chiefly terminated, is nearly coincident with the 
period of maximum tissue hydration, the former being but five or 
ten days later than the latter. 
From the foregoing facts the following appear to be the general 
laws: 
Ist, The hydration of woody plants is not constant for all sea- 
sons, and depends upon conditions of growth. 
2d. The hydration reaches its maximum during the latter part 
of May or early June, and its minimum during the month of Jan- 
‘uary. 
3d. Hydration is greatest in the sap wood ; least in that which 
is older. 
4th. Greatest hydration is directly correlated to most active 
growth of the plant; lignification and storage of starch and other 
products being correlated to diminishing hydration. 
These facts apply only to latitudes lying between New York 
- and Boston. For other latitudes, certain modifications might be 
necessary. 
:0: 
DOMESTICATION OF THE GRIZZLY BEAR. 
BY JOHN DEAN CATON, LL.D. 
E family of bears is among the most widely distributed 
groups of the quadrupeds, and is represented by a number 
of living species. They occupy the polar regions of the no 
and the temperate and torrid regions of both hemispheres. Som 
are of enormous strength and fierceness, others are diminutive 
o and comparatively mild in disposition. Nearly every species has 
= been held in captivity in considerable numbers, yet of their adap- 
~ tability to domestication but little of real scientific value has been 
~ Written, and I think I may add but little is known, for the want 
= of judicious experiment and careful observation. 
exhibited by street showmen, who have taught them various 
r ķ . . . . > i S me 
They are sometimes met with in the streets in various countries, 
amusing tricks, evincing considerable intelligence and docility, = 
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