Paper, 'On the chemical composition of the cartilage occurring in certain invertebrate animals' by W D [William Dobinson] Halliburton Halliburton writes: 'At Professor Lankester’s suggestion I have submitted to chemical analysis the cartilages occurring in Sepia and in Limulus. The basis of the cartilage is a chondrin-like body which gives the reactions of mucin and gelatin; indeed chondrin, as it occurs in the ordinary hyaline cartilage of vertebrates, is now regarded by many as a mechanical mixture of these two bodies.' Annotations in pencil and ink. Subject: Zoology / Chemistry Received 24 December 1884. Read 8 January 1885. Communicated by Edward Albert Sharpey-Schafer. A version of this paper was published in volume 38 of the Proceedings of the Royal Society as 'On the chemical composition of the cartilage occurring in certain invertebrate animals'. 1884