April 14, 1905.] 



SCIENCE. 



569 



dying, and others were examined soon after 

 death from the treatment, showed evi- 

 dence that all of the parasites had been 

 killed by the drug before the death of the 

 host. The best results in expurgation 

 came from those cases in which the dose 

 had been repeated after an interval of sev- 

 eral days, but as this method was not per- 

 fected until late in the summer, it was im- 

 possible to apply it to more than a limited 

 number of specimens. Hence these results 

 do little beyond indicating that some con- 

 tinuation of the experiments will be neces- 

 sary in order to determine a mode of treat- 

 ment effective enough for practical use in 

 expurgating sharks for experiments in 

 artificial infection. 



Infection experiments were carried out 

 during 1903 and 1904 to find out what ces- 

 tode develops from the Scolex polymorphus 

 of the 'squeteague' (Cynoscion regalis), 

 when these larvae are fed to the sand 

 shark. Each year a number of the sharks 

 thus infected were found to contain large 

 number of young Phoreihothrium trilocu- 

 latxim Linton, a eestode which is recorded 

 from the 'dusky shark' (Carckarinus oh- 

 scitrus). Some evidence was obtained 

 pointing to the conclusion that Scolex 'poly- 

 morphus likewise comprises larvae which 

 develop into the genus Crossohothrium, but 

 this evidence is so inconclusive that it can 

 have no value unless strongly confirmed 

 by the results of futher investigation. 



Bradley M. Davis, Ph.D., assistant pro- 

 fessor of botany, University of Chicago, 

 supervised the collecting and identifying 

 of marine algae in connection with the 

 dredging work, being assisted in this task 

 by Miss L. J. MacRae. Dr. Davis like- 

 wise commenced the compilation of a set 

 of records of the marine plants of this 

 region to be incorporated into the catalogue 

 of local marine fauna and flora. 



Donald W. Davis, student in Harvard 



University, assisted in the survey work, as 

 well as in certain experiments with fishes 

 to be described below. 



Irving A. Field, Thayer Scholar, Har- 

 vard University, continued, as salaried as- 

 sistant, his studies of the food of fishes of 

 little or no food value, adding to the list 

 of those investigated during the preceding 

 summer the 'horned dog-fish' {Sqxialus 

 acantkias), and the 'sand shark' (Car- 

 ckarias littoralis). Experiments with 

 view to determining the food value of the 

 common dog-fish, and to discovering other 

 possible economic uses, were likewise con- 

 tinued. 



Frederic P. Gorham, Ph.D., associate 

 professor of biology. Brown University, 

 conducted, on behalf of the bureau, (1) 

 bacteriological studies upon an epidemic 

 disease of the menhaden then prevalent in 

 Narragansett Bay and in certain parts of 

 Buzzards Bay; (2) experiments, continued 

 from the preceding year, upon the effects 

 of various sorts of metal piping upon 

 marine organisms kept in aquaria; (3) 

 studies of certain properties of the blood 

 of various marine animals. 



Clarence W. Hahn, A.M., teacher of 

 biology. New York High School of Com- 

 merce, carried on experiments upon the re- 

 generation of Holocampa, Metridium and 

 Sagartia, with view to discovering the 

 causes that determine the growth of the 

 directive mesenteries. Time was also spent 

 in collaborating results already obtained 

 on this subject. 



Lynds Jones, M.S., instructor in zoology, 

 Oberlin College, continued his studies upon 

 the food of marine birds. The living birds 

 were closely observed in their natural 

 habitat, their method of fishing and of 

 feeding their young being studied. The 

 various local nesting grounds of the terns 

 and gulls were visited, nine days being 

 spent on IMuskeget Island. Young gulls 



