100G SUMMARY OF CURRENT RESEARCHES RELATING TO 



Endogenous and Exogenous Division in Rhizopods.* — Dr. G. C. 

 Wallicli proposes to show that, whereas endogenous division in tho 

 naked amoeban Rhizopods is the prime factor in normal reproduction, 

 exogenous division is ordinarily a mere mechanical disruption of 

 the body-substance into two or moro Beparate masses, produced acci- 

 dentally by forces operating from without ; it is an abnormal lesion. 

 Ho thinks it, indeed, doubtful whether exogenous division, as he 

 understands it, ever takes place under strictly normal conditions. 

 He describes a new method of rendering visible tho nucleus ; ordi- 

 nary fractional electricity applied to living Ainoebse on a glass slido 

 instantly kills the organism, the body being burst up into a homo- 

 geneous-looking mass of granular particles, among which the nucleus 

 formed a very conspicuous object. The discharging knobs communi- 

 cating with a single small Leydcn jar are to be applied on opposite 

 sides of the glass cover in contact with the water between the cover 

 and the slide. Care must be taken not to apply too powerful a 

 discharge. 



Notes on Sporozoa.f— Prof. A. Pachinger observed three cases of 

 horses' kidneys being infested and destroyed by a sporozoon — Eimeria 

 falciformis. A new form was found in the digestive tract of the 

 domestic cat, and a third, which is perhaps new, and is called 

 Molybdis entzii, at the commencement of the small intestine of Bana 

 esculenta. 



New Species of Hsematococcus.;}: — Dr. F. Blochmann has found 

 in spring or early summer, in fresh-water basins at Schwetzingen, a 

 new species of Hsematococcus — H. ButschMi — in which the investment 

 at the swarming stage has two anterior laterally-directed tubules for 

 the passage of the flagella. There is a semilunar stigma, and two 

 or three contractile vacuoles. The swarming form is about 60 mm. 

 long, and is, with the exception of the most anterior portion and the 

 ends of the pseudopodia, of a uniform green colour ; the cause of this 

 colour is not quite certain. 



Parasitic on this new species there lives an Amoeba, which is not 

 unlike A. Umax. After feeding, its endoplasm is found to be filled 

 by gi'een protoplasmic drops obtained from the Hsematococcus. The 

 Amoeba fixes itself to the envelope of the Hsematococcus, and gradually 

 penetrates and creeps in ; it attaches itself firmly, and protrudes 

 pseudopodia, along which small drops of the protoplasm of the host 

 may be seen flowing into the body of the parasite. When it has had 

 enough it stops, and returns to the attack after a time, eating up its 

 prey bit by bit. 



Parasites of the Blood.§ — Prof. W. Danilewsky, continuing his 

 researches on the blood, notes the presence of a monad parasite — 

 Hcxamitlus (Dujardin). This form was found in the blood of Emys 

 and Bana, in ill-nourished specimens. It also occurred in the urine, 



* Ann. and Mag. Nat. Hist., xviii. (1S86) pp. 30-4. 



t Zool. Anzeig., ix. (18S6) pp. 471-2. 



% Verh. Naturhist.-med. Vcrein Heidelberg, iii. (1886) pp. 441-62 (2 pis.). 



§ Arch. Slav, de Biol., i. (18S6) pp. 85-91. 



