Meus), Now | Papers on Spontaneous Generation. 275 
sized Lyngbya ; a few aggregated round cells, with nuclei. On side 
of bottle masses of round nucleated Chlorococcus, oval green cells, 
and larger Lyngbya. B, large oval cells, round nucleated cells, and 
one green filament with vacuoles, each containing three or four chlo- 
rophyll cells. D, a few filaments of Oscillatoria; a very few round 
and oval green Gonidia. 
July 12th.—C, Chlorococcus and Lyngbya. 8, round cells; 
minute green, and full-sized, round, nucleated Chlorococcus; also oval 
green Gonidia, very active (quere, Huglena?). D, oval still Gonidia 
and Lyngbya filaments. 
July 15th.—C, every size of green Gonidia, from small, smooth 
cell to gleocapsoid granular; also of oval cells every grade to full- 
sized Lyngbya. 
July 25th—B, C, and D, all developing Chlorococeus and 
Lyngbya. A, a large quantity of Monads, some still, mostly active. 
Aug. 4th—A, Chlorococcus abundant. B, Chlorococeus and 
Lyngbya. C, Chlorococcus and Lyngbya very abundant. D, Chloro- 
coccus and rudimentary Lyngbya, with three vacuoles, each contain- 
ing a mass of chlorophyll. 
A similar experiment. In a bottle marked E, a plant of Jun- 
germania placed in 2 oz. of water on July 9th. 
July 11th.—Monads, 
», 12th.—More Monads, on small green Gonidium. 
5, 15th—Monads, active. 
» 297d.—Monads. 
Aug. 4th—Small Oscillatoria. 
» 11th—lLyngbya threads and numerous gleocapsoid cells. 
In observations made during the last two years I find that 
Euglena is developed by growth of cells, apparently from the 
transparent Monas cells given off by Lyngbya, Vaucheria, Junger- 
mania, Conferva rivularis ; in some cases, however (that of Conferva 
rivularis), it is produced from the vacuole, very similar to Dr. 
Bastian’s illustration. 
In proof of the universality of Monad forms as arising from the 
various organized substances, and thus supporting the “ab ovo” 
theory, I may refer to Dr. Bastian’s experience (p. 225) of the 
appearance of “the minutest dot-like projections,” which became 
vesicular, granular, and nucleated, arising from a Leptothrix 
thread. 
Nov. 1st, 1869.—I saw a tubule of Vaucheria burst and discharge 
Monads, many of them only distinguishable by change of light. 
Feb. 11th.—Examined Leptomitus clavatus from a dead salmon, 
and found in the water Monads as pin points visibly moving about 
one another. 
The lungs of a rabbit in water produced Vibrions and Parameecia. 
Minute dots visible only by reflected light collected from the air 
(see M. M. J., Jan., 1870, Art. V., p. 25). 
