W. A. Norton on Molecular Physics. 207 
the distinctions elsewhere seen of the large brighter and shaded 
masses, and also of the granulations on both, and the pencil- 
lines, occasionally stippled, by which the individual granules are 
distinguished. : 
Precisely the same results attended my examinations of the 
be found on 
ance which produces the elevated ridges confuses the minute 
features elsewhere seen; and that, though there may be some 
traces of granulation when the facule are viewed almost per- 
pendicularly, yet this is entirely lost when their sides only are 
seen near the Sun’s limb. In this position, however, there are 
often distinct evidences of irregularity in the elevation of differ- 
ent parts of the ridge; and these may, perhaps, when viewed 
perpendicularly, produce variations of brightness, like the gran- 
ules of extraordinary size mentioned above. 
Hopefield Observatory, Haddenham, Bucks, May 9, 1864. 
Arr. XXII—On Molecular Physics; by Prof. W. A. Norton. 
[Continued from p. 78.] j 
In considering the changes of state through which the same 
Substance may pass, we have been led to recognize as an im- 
portant physical principle upon which the mechanical prop- 
erties manifested in each new condition in a great degree depend, 
that the physical condition of the individual molecules is lable 
to permanent variations from the effect of heat; and that these 
Go 
which surround the atoms of the molecules. If we take a more 
extended view, and consider the diverse permanent changes of 
condition which the same substance may experience, while in 
regation, we may discern the operation of 
of a still more comprehensive principle; viz., that the phys 
