rd 
Geology. 279 
tearing asunder mica or paper, may produce enough of electricity to 
have some share in giving the same direction to the axes of the par- 
ticles. 
ces to crystalline arrangement are diminished ; elementary prisms, or 
crystals whose length is greater than their breadth, will have a tenden- 
cy to place their greatest length in the line of traction; and all lateral 
obstruction to the play of its natural polarities being toa great extent 
moved, when the substance is drawn into a capillary thread the mole- 
cules will have free scope to assume their natural crystalline arrange- 
ent. 
The application of these views'to the powders and particles of hard 
crystals is not so readily apprehended ; but when we consider that the 
Pieces, and combine them by turning one of them round 90° 0° 
Polarized light transmitted through them perpendicularly will exhibit 
© same colors as when they were in their natural position, and also 
the Same neutral and depolarizing axes. 1 the polarized light is trans- 
Mitted obliquely, the hemitro ism of the combination, as we may call 
on be instantly Poser by the difference of color of the two 
Plates, 
II. Gzonoey. 
1. On the Gold Fields of Victoria or Port Philip; by H. G. 
Waruen, Esq., Mining Engineer, (Quart. Jour. Geol. Soc., vol. ix, p. 
74, communicated by P. N. Jounson, Esq., F.G.S.)—General Descrip- 
> Geographical and Geological.—A chain of mountains, or rather 
* series of distinct ranges, runs round the southeastern corner of Aus- 
