Abstract
The paper deals with a study of cuticles of Arthropods by X-ray and chemical methods. It is shown that the endocuticular constitution is the same in all the animals studied, conforming to the chitin-protein complex observed by Fraenkel and Rudall. The epicuticle on the other hand showed wide variations. In scorpion and centipede, the epicuticle was found to consist largely of chitin, which was entirely unexpected. In other cases, no chitin was present in the epicuticle in agreement with the current ideas of the constitution of the epicuticle. The nature of the association between protein and chitin in the epicuticular material is also discussed.
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