12 ANNUAL REPORT OF THE 



1907. The names of the students and the titles of their theses 

 follow: Arthur Marigun Banta, A comparison of the reactions 

 of a species of terranean with those of a subterranean isopod ; 

 Herbert Spencer Davis, Spermatogenesis in Acrididae and Locusti- 

 dae ; Calvin Olin Esterly, The light-recipient organs of the copepod 

 JEucalanus elongatus. 



During the year Professor Parker has given much time to the 

 interests of the Seventh International Zoological Congress, as 

 chairman of the executive committee. 



Investigations in heredity — in which the Carnegie Institution 

 of Washington is cooperating with the Laboratory — have been 

 carried on by Assistant Professor Castle and by Professor Mark. 

 In connection with this work Professor Castle has published con- 

 tributions from this Laboratory No. 188 (with H. MacCurdy), and 

 two papers in Science (see p. 14). The results of these investi- 

 gations have been presented by Professor Castle before the 

 National Academy of Sciences, and the American Society of Zool- 

 ogists, likewise addresses before the Sigma Xi Society of the 

 University of Michigan and the American Breeders' Association. 

 A course of four lectures on heredity was also delivered by him 

 before the Brooklyn Institute of Arts and Sciences. 



Dr. Rand has made considerable progress with two lines of 

 work on earthworms, and investigations on reactions to wound- 

 ing of the tentacles in actinians. 



Professor Mark gave some time to the perfection of a machine 

 for cutting the wax plates extensively used by morphologists in 

 making models by reconstruction from microscopic sections. The 

 cutting is rapidly and satisfactorily accomplished by the use of 

 a fine platinum wire heated by an electric current and made to exe- 

 cute rapid vertical excursions by attachment to an ordinary sew- 

 ing machine. In working out the details of this machine he had 

 the valuable assistance of Mr. J. A. Long. The machine was 

 exhibited in operation at the meeting of the National Academy 

 in Boston in November, and at the meeting of the Association 

 of American Anatomists in New York in December. 



The inability of the Colonial Government of Bermuda to carry 

 out its plan of erecting a building to accommodate the Public 

 Aquarium and the Biological Station for Research, — owing to 

 financial conditions following a reduction of the naval and mili- 

 tary forces on the Islands, — caused an interruption in the work 

 of the Station for the summer of 1906. Early in 1907, however, 



