Summer schools of science proved very popular last year, and are to be continued this season. A lady who studied in the botanical school at Harvard said that work began properly at nine o'clock and continued to twelve; but the pupils were so eager to reap all possible benefit from the six weeks' course, that some were in the laboratory by 7:30 in the morning. One lady made herself sick in a week by over study, and many others injured themselves by too close application. The Professor finally prohibited work out of the regular hours. The schools will be reopened July 6, and continue to August 17, the term being six weeks long; applications to be made by June 1. The courses will be five in number, as follows: General chemistry and qualitative analysis, under Mr. C. F. Mabery, to whom (at Cambridge) applications must be sent; fee, $25 and cost of supplies. Phænogamic botany, by Prof. George L. Goodale; fee, $25. For lectures without laboratory practice the charge is $10. Cryptogamic botany will be taught by Prof. W. G. Farlow; fee, $25. Microscopes, etc., are provided by the university. Students in this course should have a previous knowledge of phænogamic botany. In addition to laboratory practice excursions will be made and lectures given. Prof. Farlow's address is 6 Park Square, Boston. Prof. N. S. Shaler and Mr. Wm. M. Davis, Jr., will give a course in geology, including instruction in Cambridge, and a trip through Massachusetts to New York. The tuition fee is $50, and other costs _about_ $50 for board and lodging, and $25 for travelling expenses. When the regular excursion is finished a more extended trip will be made if desired, to the Mammoth Cave and other localities, on the way to Nashville, where the American Association will have its next meeting. Lastly, the school provides a course on zoölogy, by Mr. W. Faxon and Mr. W. K. Brooks; fee, $25. It will comprise lectures, laboratory work, and excursions to the neighboring seashores. Apply to Mr. W. Faxon, Cambridge, Massachusetts. _The Cornell Excursion._