SUMMARY OF CURRENT RESEARCHES RELATING TO 
626 
Sporozoon Parasitic in Muscles of Decapod Crustacea.* — MM. F. 
Henneguy and P. Thelohan call attention to the presence in the muscles 
of Palsemon rectirostris of a form which appears to be intermediate 
between the Sarcosporidia on the one hand, and the Microsporidia and 
Myxosporidia on the other. Crangon vulgaris is also infested by a para- 
site which gives diseased forms the same chalky appearance as was noted 
in Palsemon; it is also found in the muscles, but is of a somewhat 
larger size ; it is shown by its life-history to be one of the Myxosporidia, 
and is very close to Glugea. 
Hsematozoa of Malaria.f — M. Laveran has recently published an 
expansion of the treatise on marsh fevers, which appeared in 1884. In 
it the author not only includes the scattered pieces published in the 
interval, but also defends his claim to the priority in the discovery of 
malaria parasites. The first chapter is devoted to the description of the 
parasites. This is pretty much the same as in the former treatise, but 
the spheroidal forms are now stated to be the most common, while with 
regard to the flagellated forms it is now stated that when the flagella 
become separated from the main body, each flagellum becomes an 
independent organism. Parasites were found 432 times out of 480 
examinations. After stating the technique for observing the parasites, 
the author discusses the nature of the parasites, and places them among 
the Sporozoa. 
In part 4 the author discusses the question of the polymorphism of the 
parasites. He inclines strongly to the side of polymorphism, declaring 
that the type of the fever is determined rather by individual conditions 
than by the variety of the parasitic elements in the blood. Part 5 deals 
with the biological conditions of the parasites, their presence in the soil, 
the source of infection, and the incubation period. According to the 
author, the incubation period is from 6-10 days, although the fever may 
remain latent some while longer. After discussing the treatment of the 
disease, the work ends with a description of forty-seven cases of the 
malady. 
Malarial Microbiosis.J — Dr. Danilewsky tries to show that birds, 
like men, suffer not only from chronic, but acute malaria. The chronic 
form is, as a rule, well borne, the parasites disappear at times, and then 
spontaneously reappear in the bluod, just as in man, and the author 
appears to think that this proves the connection of the avian parasites 
with those of man. In the acute form the red corpuscles are suddenly 
attacked, Cytozoa resembling pseudo-vacuoles appearing within them. 
These increase in size, and fill up with melanin granules. Besides the 
presence of the parasites in the blood, the birds suffer from general 
symptoms, such as fever, loss of appetite, emaciation, dyspnoea. The 
parasite becomes fully developed in 3-4 days, having undergone the 
usual fission processes, with the formation of spores, which appear free 
in the blood. 
The most important difference between the chronic and acute forms 
* Comptes Rendus, cxiv. (1892) pp. 1552-5. 
t ‘Du Paludisme et son hematozoaire,’ Paris, 1891, 8vo, pp. 300. See Centralbl. 
f. Bakteriol. u. Parasitenk., xi. (1892) pp. 510-2. 
X Annales Inst. Pasteur, 1891, p. 578. See Centralbl. f. Bakteriol. u. Parasitenk., 
xi. (1892) pp. 513-5. 
