Item is a post card advertising an insulin preparation developed by the Phila. Capsule Co. The preparation, called Capsules Insulans (Philcapco), is in capsule form to be administered orally. The post card, a form letter addressed 'Dear Doctor,' counsels physicians to specify Capsules Insulans when buying, ordering or prescribing Insulin. This post card was enclosed in a letter from Dr. G. H. A. Clowes to F. Lorne Hutchison.