The differences in chemical composition between spherulites and the matrices which contain them have been determined by many analysts. Michel Lévy, in a long and comprehensive paper, quotes some former analyses by Delesse, comparing them with his own, which they closely resembled. Lagario gives many analyses which are especially valuable, as he compares results from acid with those from intermediate and basic rocks, and finds a distinct difference between them. The relations of these results will be briefly considered at the end of the present paper.