754 Wisconsin Academy of Sciences, Arts, and Letters. 
authors above referred to. Famintzin and Woronin in their 
classic on this organism have traced its development with ad¬ 
mirable completeness from the very first appearance of the 
minute plasmodial masses to the formation of the mature fruc¬ 
tification. They were not able, however, to follow the earlier 
vegetative development within the woody tissues of the sub¬ 
stratum. But they supplement their observations on the for¬ 
mation of the fructification with figures showing the peculiar 
germination of the spores, and the final formation of young 
myxamoebae and of larger amoeboid masses which they re¬ 
gard as young plasmodia. 
I will review in some detail Famintzin and Woronin’s ac¬ 
count of the development of Ceratiomyxa hydnoides, since, 
with one or two exceptions, it agrees substantially with my 
own observations, at least so far as I have been able to carry 
them. 
Minute, cushion-like masses of fructifying protoplasm first 
appear at points on the surface of the dead wood in which the 
organism has passed its vegetative existence. As these plasmo¬ 
dial masses .increase in size by the addition of more protoplasm 
from beneath, the upper surface of each becomes more or less 
regularly papillated. With still further growth outward from 
the substratum, these papillae push out into long finger-like 
projections, which may remain simple or which may during 
their development become branched. The authors next ob¬ 
served that, as these projections grow outward, the protoplasm 
in each streams gradually to the surface, so that quite early in 
its development two distinct substances were noted—an inner 
transparent, jelly-like substance, and an outer meshwork of ac¬ 
tively streaming, opaque protoplasm. Even the base of the 
fructification, as well as the middle core, is finally entirely de¬ 
serted by the upward streaming, peripheral protoplasm. The 
outer thin zone of protoplasm is next represented as forming a 
more or less compact, thimble-shaped mass (“gleich dieken 
Schicht,” p. 3), with irregular lacunae, and in this condition 
it becomes cut up by simultaneous cleavage into a multitude of 
uninucleated segments. When viewed now from the surface, 
the segments present an epithelium-like appearance of closely- 
