1900] CELL AND NUCLEAR DIVISION IN FULIGO VARIANS 221 
My material was fixed in Flemming’s solution, weaker for- 
mula, sectioned, and stained with Flemming’s safranin, gentian- 
violet and orange. 
The formation of the aethalium of Fuligo has been very well 
described by De Bary so far as its grosser structure is con- 
cerned. The plasmodium which is ready to form spores 
creeps to the surface of the substratum, and there forms a reticu- 
lum which is similar to that of the vegetative condition except 
that it is more dense. It becomes a rounded cake-like mass, the 
meshes of the reticulum being relatively small and the protoplas- 
mic strands very thick. We have in fact at this stage a con- 
vented reticulum, the interprotoplasmic spaces having become 
minute. At this stage the solids which have been imbedded in 
the protoplasm are all thrown out upon its surface. Large 
amounts of water containing salts in solution are excreted, and, 
the Water evaporating, the salts are deposited as crystals along 
with the rejected solids. These waste materials are found in all 
the meshes of the protoplasmic reticulum, and form a sort of 
fragile framework piercing the ripe aethalium in all directions. 
The yellow coloring matter of the plasmodium is also trans- 
ferred to these waste materials, so that the protoplasm is left 
“pparently homogeneous and colorless. 
_ A further step in forming the aethalium consists in the con- 
a contraction of the protoplasmic reticulum, so that its 
6.55 cial strands are withdrawn toward the center. In this 
reanle of the protoplasm from the peripheral parts of the 
bible ° phage wastes are left behind, and form thus a ae 
Muipins of ees the surface of the protoplasmic mass. on e 
‘i Bes oi e aethalium this waste material frequently a 
forth. oats thin membranous almost papery border. In es 
atinic « a of the protoplasmic reticulum the interpro . 
- Or plates - become reduced in many cases to mere 
Q other cas € yellow colored waste materials described a _ 
lineq ith «thi the spaces remain as oval or angular ce : 
section th in yellow crust of the same excreta. Fig. 1 shows 
rough a portion of an aethalium relatively free from 
