JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATES III & IV, 



To illustrate MM. Van Tieghem and Le Monnier's Researches 

 on the Mucorini. 



Eig. 1. — Section of a zinc box for cell-cultures ; it is arranged to hold 

 two rows of slides, and is closed above by a glass plate ; the bottom is 

 covered with wet sand or moistened plaster. 



Fhycomyces nitens. 



rig. 2. — a, spherical spores from small sporangia, the central granules are 

 yellow ; h^ fresh, elongated, ellipsoidal or concavo-convex spores from large 

 sporangia; c, older spores, the wall has a double contour; d, older spores 

 germinating with rupture of the exospore (X 160). 



. Fig. 3. — a, spores in process of alteration in a moist medium, the proto- 

 plasm condenses into nodules ; h, a germinating hyplia in process of destruc- 

 tion, its base still inclosed in tlie epispore is partitioned off, and the contained 

 protoplasm is condensed into oval corpuscles ( x 320). 



rigs. 4 — 12. — Successive stages in the development of a zygospore ; 

 4 — 6, before the development of the processes ( X 40) ; 7, 8, processes 

 making their appearance from above downwards upon one of the arcuate 

 cells (x 40); 9 — 11, tlieir appearance upon the other arcuate cell simul- 

 taneously with the increase in the size of the zygospore (9 X 120, 10 and 

 11 X 40), in fig. 11 a slight traction has been apphed to the two conjugat- 

 ing filaments; 12, mature zygospore enveloped by the dichotomous processes, 

 many of which are broken ( x 50). 



Fig. 13. — Side of attachment of an arcuate cell with processes" radiating 

 all round ( X 40). 



Fig. 14. — " Vice" arrested in its development; the first process is developed 

 in its ordinary position, but has been prolonged and developed into ordinary 

 mycelial hyphse (x 120). 



Fig. 15. — Base of a sporangiferous hypha («) ; bb, sterile branches (cell- 

 culture) (X 120). 



Fig. 16. — Group of three small sporangia inserted with two sterile branches 

 on a branch {a) of the mycelial hypha {in) (cell-culture) (X 120). 



Fi"'. 17. — Basal dilatations of lateral branches {h, b) of a mycelial hypha 

 (cell-culture) (x 120). 



Thamnidium elerjans. 

 Fig. 18. — Different stages of the fructification. 

 Fig. 19. — Mycelium which has produced — (i) a large sporangium, (ii) a 



