On two species of Heterospornim particularly Heterosporium echinulatum 13 
11 p. m. (fig. 13). The conidiophore-bearing liyphae exposed to the saturated 
air of the chamber were studded with numerous minute water-drops. At 
12.30 p. m. the conidium had moved a little to one side out of the axis of the 
conidiophore and had also budded off a small oval colourless cell (fig. 14a):; 
at its distal end the head of the conidiophore had also pushed out a pa¬ 
pilla on the opposite side of the conidium (see fig. 14 b). At 2.30 a. m. 
the first formed conidium had moved still further out of the axis of the 
conidiophore, and the budded off cell at its tip was plainly seen to be 
a young conidium, and was now of the same colour as the first. The pa¬ 
pilla (b) on the opposite side of the conidiophore head had also increased 
in length, and was now seen to be a small colourless oval body (see 
fig. \bb). At 4.30 a. m. the first budded off spore was almost mature, 
while that on the conidiophore head had become a spore whose dimen¬ 
sions exceded those of the other two which were older (fig. 16 a and b). 
At 9.30 a. m. Another spore had been produced on the head of 
the conidiophore, while the previous ones had again budded. So that 
finally the head of the conidia-bearing-hypha bore two chains of spores one 
containing 3, the other 2 spores; and a third spore which had not yet 
budded any conidia. This was not drawn as the chains lay in three dimen¬ 
sions and could not he made out all at once. 
The other coloured hyphae which were noticed at first (see fig. 8) 
were observed day by day. They never reached the surface, but on the 
the contrary grew vertically down into the substratum and took on a 
brown colour. After having attained a length of 100—200 t u growth in 
length ceased. These coloured vertical hyphae were produced upon salep, 
meat extract, maltose, and glucose agars; but not on plum-juice agar. The 
ripe conidiophore heads bore from 1—4 spores, which could bud off 
spores at their distal ends so as to form chains of usually 3, sometimes 
of 4 spores, so that 1—4 chains might be present of 3—4 spores each. 
The lowest spores of these chains might bud off a spore at their tips 
and this spore might also bud off spores so that secondary chains were 
formed. No one spore, however, bore more than 2 spores at its tip, 
wheras the conidiophore head bore as many as 4 at times (see fig. 21). 
But instead of the conidiophore head bearing chains of spores, it 
may also send out a branch in place of a spore. Only one such branch 
was thus formed, no matter what the number of spores (fig. 11a, 22—24). 
A conidiophore head may bear one spore chain and one branch (fig. 11a, 
24), or 2 spore chains and one branch (fig. 22), or 3 spore chains and one 
branch (fig. 23). These branches produce swollen heads in the same 
manner as the primary conidiophore, and may in their turn bear from 
1—4 spore chains, each chain consisting of 3 spores at maturity, or 
3 chains and another branch, which repeats the process. These branches 
are usually set off at angles to one another, so that the mature conidio¬ 
phore bears a jointed appearance, each joint resembling in its swollen 
ends a bone. It is rare for any one of these branches to lie in the 
same axis as the one preceding it, but it does sometimes occur (see fig. 24). 
The spores of a chain are joined together by small transparent 
stalk-like articulations in the same way as the first-formed conidium is 
joined to the conidiophore head. On the heads of old conidiophores after 
the spores have fallen off little papillae are to be seen in the position 
of the articulations, and are probaly their remains; the same structures 
