REPORT OF EXECUTIVE COMMITTEE xli 



Zoology. 



H. E. Crampton, Columbia University, New York. Grant No. 9. 

 For deterniini7ig the laws of variation a^id inheritance of certain 

 lepidoptcra. $250. 



Abstract of Report. — In order to obtain data for the problems of 

 variation, their relation to selection, and for the study of correlation, 

 Dr. Crampton investigated the following material : 



(a) Eight hundred and forty-eight cocoons of Philosamiacy nthia. 



{b) Fourteen hundred and ten cocoons of Samia cecropia. 



(c) Four hundred cocoons of Callosamia angulifera, etc. 



{d) Sevent5''-five cocoons (preliminary) of Attacus orizaba. 



(<f) One family, Hypercheiria io. 



The data secured furnish material for examination into variation 

 and selection by comparing — 



(a) Metamorphosing and non-metamorphosing. 



{b) The perfect and imperfect survivors. 



{c) The mating and non-mating moths. 



Dr. Crampton thinks that certain general conclusions are justified 

 from the facts already determined. Surviving individuals are less 

 variable than those which succumb ; mating individuals are less 

 variable than those which fail to mate ; and the index of correlation 

 of the pupal characters is higher for the selected individuals in both 

 cases. In a word, selection proceeds upon a basis of deviations 

 from type and upon a correlative basis. 



J, E. Duerden, Chapel Hill, N. C. Grant No. 12. For iyivestiga- 

 tion of recent and fossil corals. ^i ,000. 



Abstract of Report. — With a view to obtaining suitable material 

 for continuing his researches on fossil corals, Dr. Duerden has 

 lately visited the principal museums and geological surveys in Great 

 Britain, where Paleozoic corals are most abundant. These museums, 

 and also the Smithsonian Institution, have placed at his disposal 

 numerous specimens. Other material has been purchased. These 

 collections will be studied during the present winter, with the hope 

 of showing the relationship of fossil to recent corals. 



Dr. Duerden has deposited with the Carnegie Institution, with a 

 view to its publication, the manuscript and drawings of a memoir 

 entitled ' ' The coral Siderastrcea radians and its post-larval develop- 

 ment. ' ' This work is illustrated by fifteen plates and numerous text 



