Journal 



OF THE 



NEW-YORK MICROSCOPICAL SOCIETY, 



Vol. VI. JULY, 1890. No. 3. 



FUNGI AFFECTIlVG FISHES— AN AQUARIUM STUDY. 



First Paper. Saprolegnia. 



by samuel lockwood, ph. d. 



(Rc-ad March -jth, i8go.) 



Does it not appear like the disciple's being above his master 

 when he rides his hobby at such a technical rate that one even 

 fairly informed cannot keep up with him ? But then it seems 

 erudite, and more Gcnnanico! Still, I think, the light of science 

 should not be darkness ; and the most of us know how easy it 



Description of Plate 33. 



t, 1, Thallus of Saprolegnia ferox. Its peculiar branching induced the drawing. The 

 heavy lines show the old plant ; the lighter ones, 'J, '-i, the part which grew 

 while under observation. — —Time, 55 minutes. The points, A., li, of course, 

 disappeared, each in the continuity of its own cylinder. 



13, Where the two young hyphaj met and nearly touched but diverged. 



3, A cell in which the protoplasm has turned into germ, or spore-plasma, and has 

 begun to granulate. 4, A cell in which granulation has advanced. 5, A spor- 

 angium, or mother-cell, in which the sijores are nearly ripe. 6, A sporangium 

 from which the zoospores are escaping, as motile, or swarm-spores. In this cell 

 are six spores unable to leave. 7, Three zoospores greatly enlarged, showing 

 their cilia, and general anicMboid condition. <S', The same, having become spher- 

 ical and invested in a membraneous shell, and now germinating. 



9, A forthcoming sporangium growing through the remains of aa empty sporangium, 



such as may be predicated of cell 4, when cell 5 is empty. 



10, An oogonium in which the protoplasm has become spore-plasma and is granu- 



lating. 



11, An oogonium whose contents have been taken up in making two oospheres, which 



are to be the ultimate spores of this Saprolegnia ferox. 



12, An oogonium full of oospheres, the crowding of which is lengthening the capsule 



at the top, where the rent will occur for the emission of the spores. These oogo- 

 nia in the specimens studied were much varied in form, some being almost cylin- 

 drical, some globular, the normal form being flask-like. 



