KECENT KESEAKCHES IN MINUTE LIFE. 
249 
continued until a round mass was formed, and this, bursting, 
poured out streams of infinitesimal spores. These were so mi- 
nute that u with the 1-2 5th (Powell & Leland’s) the most 
accurate observer could not have discovered their presence if he 
had not previously seen them with l-50th.” Gradually grow- 
ing and developing, these germs reproduced the parent forms. 
Their next set of observations led to still more curious results. 
They were made on the form represented in fig. 3, which 
rarely appear in the cod’s-head infusion under three or four 
months. Its average length is about l-3000th of an inch. The 
lower flagellum of this monad enables it to anchor itself, and 
having done so, it springs backwards and forwards, somewhat 
like vorticella , u except that the uncoiling was as rapid as the 
coiling.” When this creature multiplies by transverse fission, the 
anchoring flagellum becomes involved in the process and divides, 
and the same takes place when the fission is vertical, as in 
fig. 5. 
Now comes the remarkable part of these studies, which shows 
the triangular object (fig. 7) to be one of the life forms of 
fig. 3, and that the globular one (fig. 6) is only another stage. 
The masses like fig. 6 push out the little projectile c , termi- 
nating in a flagellum. The mass elongates, the new flagellum 
divides, a constriction forms slanting across the animal, and 
shortly it divides into two monads, which move off and establish 
connections with the ordinary forms, and from the fusion of the 
two arise the triangular forms like fig. 7. These, losing their 
flagella, and somewhat changing their shape, pour out from 
their three corners floods of extremely minute particles, which 
prove to be growing germs. 
Thus we find an ovoid biflagellate monad, a globular creature, 
and a triangular one, the last of which, from its aspect, might be 
supposed another species, to be only different states of the same 
thing. The globular creature splits into ovoid monads : they 
enter into conjunction with other ovoid monads and form the 
triangular creatures which pour forth myriads of spores that 
reproduce the ovoid shape; but how do the globular ones arise? 
Occasionally some larger anchoring sorts appear, become amoe- 
boid, and finally globular. 
The cod’s head infusion in an advanced state of decay yielded 
another monad with an equally remarkable history. It is repre- 
sented in fig. 8, the size being from 1 -3000th to 1 -4000th of 
an inch in its long diameter. One of its flagella is permanently 
hooked at the end, and acts as the locomotive organ, carrying 
the creature onwards in a series of jerks. This monad multi- 
plies by fission, but occasionally two enter into conjunction, 
one being distinguished by a knot at the end of his non-hooked 
flagellum (see fig. 8), where they are almost in contact. The 
