Professor William H. Pickering of the Harvard Observatory will leave Cambridge next week on an expedition to Jamaica, to do some special work with the new 135-foot telescope, which was constructed for the Observatory last year and which he will take with him. He will have Mr. E. R. Cram, one of the assistants, to help him in his observations and will be gone about six months. The new telescope has proved to be satisfactory in the tests that it has been put to in Cambridge during the past few months, and it has already given good results at the hands of Mr. S. B. Langley of the Smithsonian Institution, who last May took several photographs of the sun eclipse with it from a point in North Carolina. The instrument is taken to Jamaica that the work may be undertaken in the topics, a region better adapted for astronomical observations. It is especially hoped that some better photographs of the moon can be made than have been produced heretofore. If the work proves satisfactory the telescope will probably be sent to Arequipa, Peru, the Observatory's South American station.