1897 THE MICROSCOPE. 139 
but translucent prisms heaped one upon another. Still 
others combine laminae and prisms in rich profusion the 
angles by which these figures are bounded being invaria- 
bly 60° or 120°. Beautiful arborescent forms are not 
unfrequently produced by the peculiar mode of aggrega- 
tion of individual crystals. Of these a frosted window 
gives an example. 
A splendid little microscope suitable for seeing these 
and many such things is now made by the greatest opti- 
cal house in America and furnished by us together witha 
year’s subscription for $2.50. Or we will give one abso- 
lutely free to a new subscriber to the Journal and Micro- 
scope at $3.50 per year. 
Inclusions. 
By W. 8S. BEEKMAN, 
WEST MEDFORD, MASS. 
Inclusions are of many kinds. The life within a gall 
may be studied as such. The interesting internal crys- 
talizations, known as raphides, are inclusions with a great 
variety of characteristics. In a recent article attention 
was called to the beautiful Marcassite which may be seen 
enclosed within a crystalline coffin of delicately tinted 
Calcite. The Calcite is of a fascinating transparency ; 
only the products of “Nature’s Laboratory Creations,” 
present such exquisitely finished forms. Not but what 
the forces which operate in the chemist’s laboratory are 
identical with the forces which so mysteriously guide 
the instantaneous movement of the great army of mole- 
cules which rear the edifice. ‘The difference is in the 
matter acting and acted upon. There seems to be greater 
refinement of the more stable forms which are the per- 
manent results from many subtle changes. It is Ruskin 
who has grandly suggested, that the final results which 
seem to be ever the idea of greatest importance in 
