:: rs “rg i 4S aoe 
’ 
354 Messrs. Johnson and Blake on Kaolinite and Pholerite. 
with the aid of a straight edge, to a scale of 650 diameters, and 
to measure the angles of the drawings with the hand goniometer. 
Many of these tables are elongated in a direction parallel to one 
of the sides of the hexagon, sometimes to two diameters. They 
These aggregates have all degrees ‘of thickness, amounting in 
‘0083 of an inch. Some of them are obviously 
rical; the plates being loosely combined and somewhat separate 
from each other on one side of the prism. 
__ pulsion ‘of their water of combination. This- mineral differs 
_ from the so-called “ nacrite” in not being macled.. Some frag- 
ments from the exterior of the groups of nacrite crystals resem- 
Silica, : r Z é ss 
lumina, and trace of oxyd of iron, - 
ater, = - - - is 
oer 
bstaneé described as pholerite by Dr. F. A. Genth (ti 
% 
