240 ENTOMOLOGICAL NEWS. [| May, ’12 
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 Pisauride. His studies “On 
the Spinnerets, Cribellum, Colulus, Tracheze 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 Pentatomide. 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. 
