178 NOTES AND MEMORANDA. 



contains extremely fine granules, often arranged reticulately, 

 or it contains oil-drops. No enclosing membrane (Haut) can 

 be at first seen, but by and by this becomes evident. 



The form of the zoosporangium depends on that assumed 

 by the emerged protoplasm body — oval, elliptic, or elongate 

 and curved ; its size too is various. 



After some time there originate in the protoplasm of the 

 zoosporangium strongly refractive yellowish " nuclei ^' around 

 which are formed comparatively large zoospores, their num- 

 ber dependent on the degree of nutriment afforded (e, e). 

 These consist of clear colourless protoplasm, surrounding the 

 yellowish nucleus. They finally escape from the apex of the 

 zoosporangium by a not very large opening there originating, 

 and without being surrounded by mucus, and rapidly hurry 

 away. They are comparatively large, elongate-cylindrical, 

 rounded at both ends, sometimes somewhat constricted at the 

 middle, but as they are contractile they can vary their form 

 even to almost globular. In the middle they show a rather 

 large vacuole, and some smaller ones in front. Each carries 

 posteriorly a long flagellum. The author regards the "nucleus" 

 (Kern) as an oil-drop, but, still, treated with glycerine "it 

 appears like a solid body, which no longer refracts the light 

 like oil." After some time (about an hour) the zoospores 

 come to rest amongst the Euglense and grow into new para- 

 sites as described. 



During " culture " these parasites by degrees absolutely 

 annihilate the Euglense, so that at last, as the author per- 

 tinently remarks, "one might in fact say, but not in the sense" 

 "ofDr.Gros" (norin that of the author of the 'Beginnings of 

 Life,' who relies so largely on Dr. Gros, either, thinks the writer 

 of this abstract), " that the Euglense have become metamor- 

 phosed into the parasites." These latter developed, indeed, so 

 rapidly in the author's experiments that they formed con- 

 siderable layers, but, in the struggle for existence, they ulti- 

 mately perished for want of nutriment. 



Smooth-walled Resting-Spores. — The author proceeds then 

 to describe the sexual reproduction by means of smooth- 

 walled resting-spores. Amongst the individuals two forms 

 present themselves, which may be designated as male and 

 female. The latter are, as a rule, the larger, more or 

 less globular, but becoming irregular or angular owing to 

 the formation of haustoria. The males are smaller, club- 

 ghaped, or elongate, even spindle-shaped, of whose haustoria 

 one is developed, as a rule, like a stipes, the rest remaining 

 as filamentary, either free or having penetrated a Euglena. 

 The shapes mentioned of each are, however, subject to some 



