Allotropy

or Physical Isomerism, the term to the property po e ed by many substances differing in physical attributes, while remaining in chemical structure, Thus the Allotropy elements is illustrated by the differences of form, colour, etc., which are a umed by same element under different conditions, the different varietics of carbon (as charcoal, and diamond), phosphorus, and sulphur. Allotrapy of compounds is illustrated by the of silica (quartz, agate, and amorphous mercuric sulphide (red und black), and so on. a rule, the pa age of one allotropic form into is closely connected with change of tempe- Alloway, © parish in Ayrshire, Scotland, as containing the ruins of ‘“ Alloway’s haunted kirk” that plays e» important a part the Zam o' Shanter of Robert. Burns.