Badhamia titricularis and, Brefeldia maxima. 1 7 
a bell-jar, and the two quickly coalesced ; on October 13, 
I fed this mixed plasmodium with Merulins , which it de- 
voured, and all went into sporangia together eleven days after. 
In connection with the change to sporangia I here refer 
to a beautiful exhibition of spore-formation which came under 
my notice in a specimen of Brefeldia maxima. 
On November 27, 1887, a large mass of opaque white plas- 
modium was found emerging from the ground at the foot of an 
old fir stump. I cut off a part which had spread over some dead 
oak leaves, and placed it in a glass box with the cut surface 
against the side (Fig. 5). The piece was cushion-like in form, 
apparently homogeneous in substance, and closely studded 
with papillae. The face resting against the glass measured an 
inch and a quarter in length, and half an inch in height. 
At ten o’clock on the following morning, the base and 
central part of the cut surface assumed a loose spongy 
texture, which, as the day advanced, became filled with air 
and occupied about half the area of the section. 
At 11 A.M. a flush of pale purple appeared along the upper 
edge of the spongy tissue ; upon this rested the broad white 
mass of the aethalium, composed of narrow and somewhat 
branching sporangia, closely cohering together and spreading 
radially towards the surface, where they terminated in the 
papillae before mentioned. 
About 2 P.M. the papillae lying against the glass began 
to push upwards irregular and broad extensions sufficiently 
thin to be examined by transmitted light, and filled with 
remarkably large colourless granules measuring from 2/x to 
4 [k in diameter ; the movement among these granules was 
extremely slow and difficult to follow, except when they 
poured into the pseudopodia which were here and there 
thrown out; no vacuoles were visible. At about 3.30 the large 
granules broke up into very minute bodies and numerous 
vacuoles made their appearance; and now for the first time 
the streaming movement was observed with alternate flow 
at intervals of about two minutes. This condition of things 
C 
