Journal of Applied Microscopy. -123 



molecules which may be thrown off through changes due to activity, and renewed 

 from the nutritive fluid (restitution, assimilation). Stimulation causes separation 

 of these atoms. 



(4) At the cathod, ions unite with the atomic groups laid there and produce 

 action by augmentation. 



The molecular rows of the axis cylinders and of the contractile substances 

 may be separated out in the differentiation of nerve and muscle substance, from 

 the protoplasm, in the same way in which we may suppose that molecular rings 

 are formed into the thread-like structures of the nucleus during the phylogenetic 

 changes of the living protoplasm. e. m. b. 



NEWS AND NOTES. 



Wood's Holl Marine Biological Laboratory. — The twelfth session of 

 the Marine Biological Laboratory at Wood's Holl, Massachusetts, opened June 

 first. The regular work of different classes will begin in the latter part of June, 

 and the first of July. Instruction will be given by specialists in embryology, 

 cytology, animal morphology, general and comparative physiology, comparative 

 psychology, and botany. There will be day and evening lectures by leading 

 investigators of this country, and seminars for the discussion of recent progress 

 in different branches of biology. Applications for tables should be made to 

 the director. Dr. C. O. Whitman of the University of Chicago, or to Dr. T. H. 

 Montgomery, jr.. University of Pennsylvania. 



Cold Spring Harbor Marine Biological Laboratory. — The regular 

 class work of the Marine Biological Laboratory at Cold Spring Harbor, 

 Long Island, will begin July 5th and continue for six weeks, although special 

 students may use the laboratory from the middle of June until the middle 

 of September, if desired. The director, Dr. C. B. Davenport, of Harvard 

 University, will be assisted by specialists from various universities, and there 

 will be a course of evening lectures by prominent scientists. The laboratory has 

 a pleasant location on the northern coast of Long Island, near the New York 

 Fish Commission, and is only about thirty miles from New York. While every 

 facility is offered for investigation, teachers and others who wish instruction in 

 new lines of work will find courses well adapted to their wants, and will also 

 have opportunities to get in touch with important questions of the biological 

 world. Information regarding the school may be obtained from Prof. Franklin 

 W. Hooper, 502 Fulton street, Brooklyn, N. Y. 



The American Microscopical Society. — The twenty-second annual meet- 

 ing of the American Microscopical Society will be held at Columbus, Ohio, 

 August 17, U^, and 19, 1899. Reduced rates of a fare and a third have been 

 secured, and a large gathering of microscopical workers is expected. The meet- 

 ings will be held in the elegant new Biological hall of the Ohio State University, 

 which was designed for the special accommodation of the departments of ento- 

 mology, zoology, anatomy, and physiology, and is fully equipped with all the 



