144 CARNEGIE INSTITUTION OF WASHINGTON. 



Eurete. In both cases the point of difference was one involving the 

 shape of a characteristic spicule. 



N. Yatsu, Columbia University, New York. Grant No. 138. For 

 experhne^ital st7idie& of the Nemertine egg. $300. 



Abstract of Report.— yix. Yatsu reports that he carried out, under 

 this grant, series of experiments on the Nemertine eggs, during the 

 summer of 1904, at the Harpswell lyaboratory of Tufts College, 

 South Harpswell, Me. The object of his work, which requires 

 three or four summers, is to obtain a thorough knowledge of local- 

 ization of the germinal regions of each stage of development, taking 

 the egg of Ccrcbratulus ladeus as a type, and to find out, in the end, 

 the initiating factor or factors of tissue differentiation. To this 

 end, by removal and isolation experiments, he studied very success- 

 fulh^ the morphogenic as well as cleavage factors in the early stages 

 of development, and added several facts new to physiological embry- 

 ology. He also used calcium-free water to modif}' the mode of 

 cleavage. He actually demonstrated by crucial experiments the 

 formation de novo of centricles in the egg-cytoplasm. This is a very 

 important contribution to experimental cytology. 



Marine Biological Laboratory, Woods Hole, Mass. J. Blakely 

 Hoar, treasurer. Grant No. 123. For viaintcjiancc of 20 tables. 

 (For first report see Year Book No. 2, p. xlv.) $10,000. 



Abstract of Report. — As in the year 1903, the grant was made to 

 aid the laboratory by paying for the maintenance of twenty research 

 tables. The persons assigned to the tables were selected by the 

 Carnegie Institution. The following seventeen persons occupied 

 the Carnegie tables during the season of 1903 : 



Bryan, Walter, College of City of New York, August 3 to after September 12. 

 Carlson, Anton J., Stanford University, June 3 to September 5. 

 King, Cyrus Ambrose, DeWitt Clinton High School, July 7 to August 25. 

 Koch, Jvilius A., Western University of Pennsylvania, July 7 to August 10. 

 Kraemer, Henry, Philadelphia College of Pharmacy, July 12 to August 17. 

 Lewis, Warren H., Johns Hopkins University, June 27 to August 29. 

 L/oeb, Leo, University of Pennsylvania, July 3 to September 3. 

 McClendon, J. F., University of Pennsylvania, July 13 to after September 12. 

 Minor, Marie L., Wadleigh High School, N. Y. City, July 14 to August 20. 

 Rhodes, Frederick A., Western University of Pennsylvania, July 7 to August 10. 

 Richardson, Harriet, Washington, D. C, June 17 to September 10. 

 Simons, Etoile B., The University of Chicago, June 30 to August 29. 

 Spaulding, Edward Gleason, College of City of New York, June 27 to August ri. 

 Streeter, George L., Johns Hopkins Medical School, July 2 to August 27. 

 Strong, R. M., The University of Chicago, July 30 to aHer September 12. 

 Treadwell, Aaron L , Vassar College, June 22 to ^r^/t';' September 10. 

 Yerkes, R. M., Harvard College, August 15 to September 12. 



