RKPORT OP EXECUTIVE COMMITTEE xliii 



All the collections and specimens have not yet been received by 

 Dr. Howard, but every observer will send a series of specimens of 

 adults, eggs, larvae, and pupae, together with cast larval skins of 

 all species observed. These have been and will be accompanied by 

 full notes of habits, etc., together with drawings of structural 

 peculiarities. 



H. S. Jennings, University of Michigan, Ann Arbor, Mich. Grant 

 No. 15. For experimeyits on the behavior of lower animals. 



$250. 



Abstract of Report. — Dr. Jennings, who is a research assistant of 

 the Carnegie Institution, is now at the Marine Biological Laboratory 

 at Naples, carrying forward investigations on the reactions and be- 

 havior of very low organisms, such as Amoeba and other Rhizopoda. 

 He expects to have a general work in regard to the behavior of the 

 lowest organisms ready for publication during the year. He has 

 submitted to the Institution for publication a paper entitled ' ' Reac- 

 tions to heat, light, and other stimuli in the ciliate infusoria and in 

 Rotifera, with considerations on the theories of animal behavior. ' ' 



C. E. McClung, Kansas University, Lawrence, Kans. Grant No. 16. 

 To ynaking a comparative study of the spermatogenesis of insects 

 and other classes of arthropods, and if possible to determine the 

 specific finctions of the differoit chromosomes. $500. 



Abstract of Report. — Professor McClung reports that owing to the 

 fact that his own work and that of others show the main features of 

 insect spermatogenesis, he determined to make use of the grant for 

 the prosecution of other more difficult and expensive studies. He 

 commenced by purchasing some literature to which he did not have 

 access, and began the search for an object upon which he might 

 prosecute his investigations. There appeared to be two ways to get 

 at the problem — to study the germ cells of hybrids or to experiment 

 upon fertilized eggs in the early cleavage stages. He decided to 

 adopt the first mentioned plan for the beginning of the work. With 

 this object in view, he spent the summer at the Woods Hole Marine 

 Biological Laboratory, but did not succeed in obtaining satisfactory 

 forms of hybrids. He feels certain, however, that if the proper 

 animals are secured the true function of the chromosomes may be 

 settled as definitely as any other fact relating to cell structure. 



