326 Marshall Ward. — On a lily -disease. 
central part of the drop, and grew in the direction of abundant 
food-supply. 
By 8.30 a.m. on July 9th, the mycelium had grown too 
large to be drawn under the higher power, and Fig. 16 shows 
its relative dimensions under a much lower objective (Zeiss B, 
instead of D). The chief changes noticeable are the increased 
branching, and the formation of certain peculiar cross-con- 
nections by the fusion of the tips of lateral hyphae, of which 
I shall have more to say presently. Three such cross-unions 
have been formed, as shown at and these are only the 
forerunners of many more, as may be seen in Fig. 17, which 
shows the same mycelium on July nth, i.e. two days after 
the last, as far as could be sketched on one plane. As shown 
by the lines bounding the rectangular area depicted, there 
are a few leading hyphae which run out beyond the drawing ; 
but these are not important. What is more important, 
however, is the development of numerous, short, erect hyphae 
leading up to the lower surface of the cover-slip, and certain 
others which go down into the depths of the damp-chamber. 
These hyphae, being at right angles to the general plane of 
the mycelium, could not be drawn in such a sketch, but I 
hope to make their conformation and arrangement, etc. 
intelligible in what follows. Even a glance at Fig. 17 shows 
that very numerous cross-connections are now established, so 
that the mycelium has become a real net-work of hyphae ; it 
should also be noted that the general character of the my- 
celium has now been changed by the development of numerous 
tufts of thin, sinuous, tendril-like hyphae, chiefly at the ends 
of lateral branches. Complex as this four-days-old mycelium 
already is, it is not difficult to trace still the main, stouter 
branches of the previous stages ; these give off branches in 
all directions, and of many degrees of tenuity. Excepting 
that several of the larger branches have more numerous septa 
than before, and that their protoplasm is now more or dess 
vacuolated, and their walls begin to show a tinge of brown, 
there are no further changes of importance to be noted in 
Fig. 17. 
