The heat-of-transition rule, heat-of-fusion rule, infrared rule and density rule, which concern the relative stability of polymorphic molecular crystals, have been checked experimentally. Among the 228 transitions examined, there are only few exceptions, and these mainly concern the infrared and density rules. The heat-of-transition and heat-of-fusion rules, however, give the right result in more than 99% of cases. If certain restrictions are observed, the other rules are also fairly reliable. By their means the stability relations in polymorphic systems can easily be clarified. Data are given for 113 polymorphic substances.

On the polymorphism of pharmaceuticals and other molecular crystals. II

Structure and order in thermal dehydrations of crystalline solids

Heat capacity of liquids : critical review and recommended values

Mechanisms for the formation of ions in flames

Learning polymer crystallization with the aid of linear, branched and cyclic model compounds.

CCXI.—The melting points and heats of crystallisation of the normal long-chain hydrocarbons

297. The heats of crystallisation of methyl and ethyl esters of monobasic fatty acids

X.—The dehydration of copper sulphate pentahydrate

296. The melting points of long-chain carbon compounds

CCXLII.—Alternation in the heats of crystallisation of the normal monobasic fatty acids. Part IV

William Edward Garner

Papers

CCXI.—The melting points and heats of crystallisation of the normal long-chain hydrocarbons

297. The heats of crystallisation of methyl and ethyl esters of monobasic fatty acids

X.—The dehydration of copper sulphate pentahydrate

296. The melting points of long-chain carbon compounds

CCXLII.—Alternation in the heats of crystallisation of the normal monobasic fatty acids. Part IV