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A comparison is next made of the properties of two closely-allied liquids, like methylic and ethylic alcohol; and by this time the student attains sufficient skill in experimenting to make a comparison between two aëriform substances, like oxygen gas and carbonic dioxide.

Professor Martin, while in connection with the Johns Hopkins University, performed an equally careful series of experiments in regard to the action of ethylic, or ordinary alcohol, directly on the cardiac structures of the dog, and with the same results.

The result was that several years of study, beginning with 1863, were given to the physiological effects of various alcohols, ethylic alcohol, which is the active principle in wines, beers and other intoxicating drinks, receiving special attention.

In my hands ethylic alcohol and other bodies of the same group; viz. methylic, propylic, butylic, and amylic alcohols were tested purely from the physiological point of view.

Purified ether from which the ethylic alcohol has been removed by washing with distilled water, and most of the water by subsequent distillation in the presence of calcium chloride and lime.