Show properties of the nulty buby the me chief scientific interest of the ru ruby by corundum hows flows from the extraordinary peculiarities of structure that it presents as well as from tho the mysterious qualities that determine its striking color it la Is found lit in crystals of 0 great variety of shapes but all having a 0 tendency to the peculiar habit of growth known to crystal log raphers as is twining by testing crystals ol of corundum with polarized light its structure Is found to be wonderfully complex land under the microscope its exterior face is 13 covered with a image network of sculpture turo indicative of molecular changes but probably the mot most interesting thing bout about corundum crystal Is 19 the tat fact that it la is nearly always found to have enclosed arid and surrounded surround d sortie foreign body or other which ilea in its midst stranger still la is the fact that these included for foreign ign bodies lie ite generally disposed in planes meeting each other at an angle of 60 degrees deir the result being to the phenomenon of asterism which la fil the term given to the white star of light 1 which Is 13 observable on certain jewels cut with a rounded surface very frequently tho the imprisoned body la Is a minute bubble of gas gaa or dr drop 0 p of liquid containing sometimes bittl e crystals of it its 0 own wn th the 0 in ca containing tat A ng these thee things are often numerous for a long time the nature of the gas gaa and fluid contained in the cavi cavities ties remained reina loti a mystery the english glish ihl lo sopher brewster brewst Bre wEter r was induced to lo in vesti giLts the subject by hearing that a ruby which cin edinburgh jeweler had placed in ills big mouth had exploded while in that position posH lon with un unpleasant plesant r re suits other followed toll owed and it has hafl now ben been made cortale that tile the fluid Is tie no other than liquid car field gas reduced to that condl tion by being under great pressure jewelers Jew elars circular |