242 REPORTS ON INVESTIGATIONS AND PROJECTS. 



The work of cross- fertilization between mice and rats by means of arti- 

 ficial insemination, which was unsuccessfully attempted in conjunction with 

 Mr. S. Morgulis, has been again taken up, now in cooperation with Dr. Long. 

 The stock of mice was shipped to Dr. Long in Berkeley, California, and a 

 small stock of rats has been purchased for these experiments. 



Grant No. 492. — A separate grant has been made to Dr. Castle for the 

 continuation of his work in the field of this grant. 



The work on parasitic hymenoptera, which was interrupted by the failure 

 of cold-storage material, has not advanced since the last report, owing in part 

 to inability to control the material. Consequently similar work on another 

 group of Arthropods was begun in cooperation with a graduate student in 

 Harvard University, Mr. R. A. Spaeth. A study of the chromosomes in 

 maturing eggs of several species of Copepoda was undertaken with a view 

 to ascertaining whether the chromosome conditions were sufficiently differ- 

 ent in different species to make crossing a promising means of studying the 

 significance of chromosomes in inheritance, A considerable amount of ma- 

 terial has been prepared and studied far enough to show that the chromo- 

 some conditions are favorable and that interesting results may be expected, 

 provided the desired hybrids can be produced. Although this has not yet 

 been accomplished, we have grounds for believing that in time it can be done. 



Naples Zoological Station, Naples, Italy. Grant No. 613. Maintenance of 

 the two tables for American biologists. (For previous reports see Year 

 Books Nos. 2-8, inclusive.) $1,000 



During the last term the two Carnegie Institution tables have been occu- 

 pied by Mr. T. Gudernatsch, April 4 to May 29, 1910, Prof. C. R. Stockard, 

 April 15 to July 7, 1910, and Mr. M. Goldman, May 2 to June i, 1910. Mr. 

 Gudernatsch is a subject of the Austrian Empire. In future the principle 

 will be strictly observed that the tables be granted only to citizens of the re- 

 spective States. The Carnegie Institution of Washington has already ac- 

 cepted this view, and it is recognized by Austria and other governments. 

 The observation of this principle is indeed a necessity to the Zoological 

 Station. 



The geological work of Mr. Goldman has been furthered, and it is satis- 

 factory to state that the construction of the large physiological and chemical 

 laboratories has extended the range of sciences previously studied in the 

 Zoological Station. The word "table" now, indeed, in consequence of the 

 parallel development and the growth of the whole of the Zoological Station, 

 possesses a wider significance than merely "zoological." Morphologists, 

 physiologists, and chemists will now find all the necessary appliances enabling 

 them to work independently on the problem of marine biology. 



During last spring 68 naturalists were simultaneously working in this sta- 

 tion and in the last year there were altogether 164 scientists, amongst whom 

 14 were Americans. 



