Journal of Applied Microscopy. 



151 



Risser, J., Iowa College. 



Rynearson, Edward, High School, 

 Pittsburg, Pa. 



Sampson, L. V., Bryn Mawr College. 



Shearer, C, McGill University. 



Smallwood, W. M., Alleghany College. 



Strong, O. S., Columbia University. 



Treadwell, A. L., Miami University. 



Turner, A. H., Mt. Holyoke College. 



Waite, L., Harvard University. 



Watase, S., University of Chicago. 



Wing, A. G., "Woman's College, Brown 

 University. 



Wilson, E. B., Columbia University. 



INVERTEBRATE ZOOLOGY. 



Allen, L. W., University of Chicago. 



Ballou, A. M., Brown University. 



Bishop, W. H., Delaware College. 



Chandler, A. P., Wellesley College. 



Cleverdon, E., University of Michigan. 



Eckel, Li. S., Fenn Grammer School. 



Enteman, M. M., University of Wis- 

 consin. 



Garrey, G. H., University of Chicago. 



Mesenthal, H. C, Columbia University. 



Mix, G. D., Drury College. 



Parke, H. H., University of Michigan. 



Perkins, M. A., Smith College. 



Pierce, R. M. 



Rea, P. M., Williams College. 



Read, E. A., Mt. Holyoke College. 



Rucker, A., University of Texas. 



Rushmore, J. C, Williams College. 



Savage, A. D., Hancock School. 



Stickney, W., Dartmouth College. 



Stone, E. L., Woman's College, Balti- 

 more. 



Sylvester, P. H., Harvard University. 



Taft, E. F. W., Canston, R. I. 



Wood, M. A., Woman's College, Balti- 

 more. 



Zinser, H. W., Columbia University. 



EMBRYOLOGY. 



Atwater, D. H., Syracuse University. 



Barrows, A. L, Smith College. 



Block, E. B., University of Minnesota. 



Budington, R. A., Williams College. 



Busch, F. C, University of Buffalo. 



Chester, W. M., Colgate University. 



Conley, W. T., High School, Columbia, 

 Mo. 



Crampton, C. W., College of Physicians 

 and Surgeons. 



Francis, W. W., Johns Hopkins Uni- 

 versity. 



Fried, G. A., Harvard University. 



Goldfrank, F., Harvard University. 



Hart, M. E., Western College. 



Hindley, E., Brown University. 



Humeston, E. J., Hamilton College. 



Kerr, A. T. Jr., University of Buffalo. 



Kirkbridge, M. B., University of Penn- 

 sylvania. 



Kroeber, J., Bryn Mawr College. 



Landacre, F. L., Ohio State University. 



McCuUoch, R., Vassar College. 



Newman, H. H., University of Chicago. 



Richardson, H. H., Smith. Institute. 



Sachs, E., Harvard University. 



Scott, G. G., Williams College. 



Simonds, M. E., Woman's Medical Col- 

 lege, N. Y. 



Stein, Leo D., Johns Hopkins Univer- 

 sity. 



BOTANY. 



Conover, L. L., Detroit High School. 



Crocker, A. C, Williams College. 



Davis, Bradley M., University of Chi- 

 cago. 



Haroer, R. A., University of Wisconsin. 



Loder, E., University of Pennsylvania. 



Lyon, P. M., University of Chicago. 



McRae, L. J., Franklin Gram. School, 

 Boston. 



Minor, M. L., Girls' High School, N. T. 



Moore, G. T., Harvard University. 



Morse, C. L., Wellesley College. 



Newman, H. C, Woman's College, Bal- 

 timore. 



Paterson, R. C, McGill University. 



Round, E. M., High School, Providence, 

 R. I. 



Semour, B., Vassar College. • 



Shaw, "W. R. 



Smith, W. R., University of Chicago. 



Smith, F. G., Smith College. 



Owing to the extreme variation which 

 existed in the sizes of threads and in the 

 diameters of the screw of microscope ob- 

 jectives, making it impossible to use ob- 

 jectives of various makes interchanage- 

 ably on the same instrument, the Royal 

 Microscopical Society adopted a stand- 

 ard screw according to the following 

 specifications: 



Thread — Whitworth screw, i. e., a V 

 shaped thread, sides of thread inclined 

 at an angle of 55° to each other, one- 

 sixth of the V depth being rounded off 

 at the top and the bottom of the 

 threads. 



Pitch, 36 to the inch. 



Diameter of thread on object glass, 

 0.7982 inch. 



Diameter of screw of nosepiece, 0.7674 

 inch. 



All manufacturers of microscopes were 

 asked to adopt these standard sizes and 

 to use them on their instruments. In 

 order to insure uniformity, should manu- 

 facturers adopt their suggestion, they 

 offered to supply standardized taps and 

 dies to all makers requesting them. The 

 most prominent manufacturers in Eu- 

 rope and America adopted the suggestion 

 of the society a number of years ago and 

 were supplied with the taps and dies. 



The society was very unfortunate in 

 sending out taps and dies which were 

 not perfectly standardized, and, al- 

 though the various makers tried to meet 

 the requirements and probably did make 



