As long as the identification of single salts in solution forms an important part of the practical examination in Chemistry, students will make use of a scheme for this purpose, and as it is better to give them. A good scheme than to leave them to pick up a bad one, a scheme was added, care being taken to make it as free as possible from objectionable short-cuts. During the last few years considerable changes have been made in the work of the class of Practical Chemistry for students of medicine. The object in View in making these changes was to render the class more useful in giving the medical student a sound, intelligent knowledge of the principles of Chemistry. The changes consist in deferring the systematic examination of unknown salts until the student has performed a considerable amount of other experimental work, all of it more or less connected with salts and their properties. Among the experiments some are chosen to illustrate subjects dealt with early in the lectures on Chemistry, such as the decom position of limestone by heat, while others are typical salt preparations and decompositions which, moreover, exemplify methods of preparing the more important gases. These experiments are so selected that very simple apparatus may suffice.