240 ENTOMOLOGICAL NEWS. [May, 'l2 



The results of Professor Montgomery's research in the 

 technically difficult problems of cellular structure and its rela- 

 tion to the phenomena of heredity and the determination of 

 sex, in the activities, habits and development of spiders and 

 birds, in the structure and development of various rotifers and 

 insects have been embodied in more than eighty articles. He 

 also published a volume, "Analysis of Racial Descent in Ani- 

 mals," 1906, and has left in manuscript a nearly completed 

 work on cytology. 



His chief claim to mention in an entomological journal rests 

 on his work on spiders and on the fact that much of his cyto- 

 logical research was based on insect material. 



His taxonomic papers on the Araneads deal with the fam- 

 ilies Lycosidae, Oxyopidae and Pisauridae. His studies "On 

 the Spinnerets, Cribellum, Colulus, Tracheae and Lung- 

 Books" (1909) led him to deny the prevalent view that the 

 Arachnida have developed from the Paleostraca by adaptation 

 to land life. He investigated the embryonic development of 

 Theridium, and published many interesting observations on 

 the courtship, mating and cocooning habits of various species, 

 based on spiders which he kept in great numbers of small 

 glass boxes on his tables in the laboratory and at home. 



To the NEWS for January, 1902, Prof. Montgomery con- 

 tributed a list of the Hemiptera Heteroptera of Wood's Hole, 

 Massachusetts, and this group of insects furnished much ma- 

 terial for his researches on the sex cells of different families, 

 especially the Pentatomidde. His discoveries as to the struc- 

 ture and history of the germ cells are many and notable; chief 

 among these may be mentioned the fact, which he first sug- 

 gested, that the chromosomes (or colorable bodies of the nu- 

 cleus) unite together in pairs during the ripening of the germ 

 cells, one member of each pair being derived from the father, 

 the other from the mother. Another was of the existence of 

 modified chromosomes in spermatozoa, but not in eggs of the 

 same species. These discoveries have formed the basis of some 

 of the most important recent studies and theories on heredity. 



