534 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Trichinosis in the Dog.* * * § — Two small dogs were fed on the flesh of 
a trichinous pig, and both took the disease ; one dog, says Herr Dlugay, 
became restless on the third week and was attacked with cramps, later 
on becoming quite palsied in the hind-quarters. The temperature was 
39° *4. From the corners of the eyes exuded a purulent secretion, and 
at the beginning of the illness there were bloody motions. The animal 
was poisoned. At the post-mortem examination no striking lesions were 
found, but on microscopical examination of the muscles numerous 
Trichinae were detected. The second, an older dog, recovered. 
Development of Strongylus paradoxus.f — Herr Hs. Spemann cor- 
roborates, in regard to this species, the results which Boveri reached in 
his study of Ascaris megalocephala. Of this, however, the full account 
has not yet appeared. 
Influence of Cold on Maturation and Fertilisation.^;— Dr. L. Sala 
has published a full account of his experiments as to the influence of cold 
on the maturation and fertilisation of the ova of Ascaris megalocephala, 
a preliminary notice of which we have already summarised. 
Cold may render polyspermy possible, or prevent any fertilisation ; 
the yolk-substance is changed as its staining reactions show ; the forma- 
tion of the vitelline membrane is inhibited ; the disposition and number 
of chromatin-elements is altered, and so on. There is certainly an ovum- 
centrosome, which is, however, modified before the process of maturation. 
Both the directive spindles and the first cleavage spindle are markedly 
modified from the normal. 
Classification of Acanthocephali.§ — Dr. 0. Hamann divides the 
Acanthocephali into three families. The first is that of the Ec'hino- 
rhynchidse, which contains most species; the second is that of the 
Gigantorhynchidse, which contains three large annulate species, and 
perhaps also E. gigas ; the third family, or that of the Neorhynchidse, 
consists as yet of two species, which are remarkable for retaining some 
of their embryonic characters, while the larvae are provided with 
generative organs. 
Two new Chsetognaths.lj — Mr. F. S. Conant describes two new 
Chaetognaths which he calls Spadella schizoptera and Sagitia hispida, 
from Bimini, one of the Bahama Islands. He points out that with 
regard to the classification of the Chaetognaths the new species of 
Spadella presents this difficulty that it has the fins of one genus with 
the morphological characteristics of the other. By the systems of 
Langerhans or Hertwig it would, on the strength of a single external 
resemblance, be separated from its nearest allies, but the system of 
Grassi, while keeping it in the same genus as its fellows, would reverse 
the usual name of that genus and call it Sagitta. 
* Berl. Tierarztl. Wochenschr., 1894, No. 21. See Centralbl. f. Bakteriol. u. 
Parasitenk., l te Abt., xvii. (1895) pp. 911-2. 
t Zool. Jahrb. Abth. Anat. Ontog., viii. (1895) pp. 301-17 (3 pis.). 
% Arch. f. Mikr. Anat., xliv. (1895) pp. 422-98 (5 pis.). 
§ ‘ Die Nemathelminthen,’ Jena, 1895. See Zool. Centralbl., ii. (1895) pp. 238-40. 
II Johns Hopkins Univ. Circ., xiv. (1895) pp. 77-81 (2 figs.). 
