526 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
is almost as large as it. In structure it recalls a little tlie silk-forming 
and many other tubular glands. The tube itself is formed of cells 
placed end to end, eacb of which surrounds the lumen of the canal ; the 
nuclei of these cells are large, and the protoplasm is strongly striated. 
Further details are promised. 
Hematohelminth.es. 
Development of Ascaris megalocephala.* — Dr, B. Zoja has studied 
the cell-lineage in the early development of this Nematode. He fol- 
lowed it partly on sections and partly on in toto preparations. His 
coloured diagrams make it easy to follow the lineage, but the details are 
not so readily put in words. The accompanying diagram, slightly 
modified from Boveri, sums up a few of the outstanding results. 
Here O represents cells with primitive nuclei, beginning with yd, 
the fertilised ovum ; -Q)- represents cells in which a diminution of the 
chromatin has occurred ; © represents cells with diminished nuclei. 
Nematode Embryos in the Skin of the Dog.f — Dr. J. G. Schneider 
has examined the causes of an affection of the dog which has been called 
Dermatitis verminosa. This appears to be due to a new species of 
Nematode, belonging to the group which is ordinarily found living in 
decaying vegetable substances. They no doubt enter the skin by means 
of the hair-follicles. They are characterised by the eighteen regularly 
alternating preanal ventral papillae, and by the constrictor muscle of 
the pharynx. 
Filaria Mansoni.f — Dr. P. S. Magalbaes seems, after all, to have 
been the first to give a description of the worm to which, nearly twenty 
years since, Dr. Cobbold gave the above name. The author’s first de- 
scription was published in 1888, in what appears to be an obscure 
Brazilian medical newspaper. Correspondence with Dr. Manson showed 
him that he had discovered the form for which Cobbold had proposed 
* Arch. f. Mikr. Anat., xlvii. pp. 218-60 (2 pis.) 
t See Centralbl. f. Bakteriol. u. Parasitenk., xx. (1896) pp. 115-6. 
% Bull. Soc. Zool. France, xx. (1895) pp. 241-4. 
