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W. A. Norton on Molecular Physics. 213 
attractive force attendant upon the union of the next set of 
molecules may determine this result. 
determine the figure of equilibrium assumed, may be inferred 
from the general considerations already presented (pp. 210 and 
211). The compression of the molecular atmospheres in the 
first plane of crystallization, will tend to develop a third axis 
of attraction perpendicular to this plane. Various systems of 
intervals between parallel pairs of these particles, or opposite 
= Centre, of the quadrilateral figure, which they form.’ Aire 
ceive spheroids to be inscribed in the polyhedral figures of the 
compound crystal molecules just supposed, to obtain the repre- 
‘Sentative spheroidal molecules of Prof. Dana; which: will also 
