337 
Marshall Ward. — On a lily -disease. 
It will be seen from the foregoing how very rapidly the 
conidia develop when once they begin to form. I have a 
few other observations on the rate of growth of the ordinary 
hyphae, but they are not sufficiently extensive or systematic 
to be of much value : they are added here simply to show how 
measurements might be made if the subject was pursued. 
Thus, the young conidiophore in Fig. 39 was growing at the 
apex at such a rate that the portion x-x in a increased to 
x-x' in b, in the interval between 11.30 a.m. and 3.20 p.m. 
(the temperature averaging I2°-J5° C.), and two more septa 
were put in. 
As another instance I may refer to Fig. 40, where the 
mycelium was growing in a culture-drop in which a piece of 
lily-bulb was suspended. At 2.55 P- m - a hypha was seen in 
the position shown in the drawing (Fig. 40 a) : b shows the 
relative positions at 3.5 p.m,, and c at 3.30 p.m., the tempera- 
ture averaging i2°-i5° C. 
In Fig. 41, the hypha a was in the position drawn at 3.2 
p.m., its apex pointing towards an intercellular space of a 
piece of lily-bulb near it. At 3.7 p.m. its tip was at the first 
x , and at 3.12 it was at the second x ; the temperature was as 
before. As already stated, I regard these as mere notes taken 
by the way, since I was not at the time concerned with the 
question of the rate of growth, being in fact engaged in ob- 
serving the entrance of the hyphae into pieces of tissue : so 
far as they go they are accurate, but numerous observations 
would be needed to make the matter clear in all its details, and 
it is not improbable that this fungus would afford a very 
favourable object for such observations. 
I now pass on to the consideration of a phenomenon which 
seems to be of considerable importance, and so far as I can 
discover has never been described before. 
In cultures of the fungus, both in hanging drops and on 
a larger scale, it is often noticed that the tips of the hyphae, at 
a certain stage of development, exude small drops of a trans- 
lucent viscous fluid or semi-fluid substance, containing a 
number of minute brilliant granules ; these drops may then 
