Marshall Ward— On a lily -disease. 325 
observed that the hyphae of the others are more vigorous— 
they have been slightly nourished by the remains of the dead 
spore. 
If the conidia are sown in a drop of suitable culture-fluid, 
instead of in pure water, the influence of the food-supply 
makes itself felt from the first moment of germination, as is at 
once evident on comparing the preceding figures with Figs. 
13-16, and Fig. 33. 
The chief difference is that the mycelium grows more 
rapidly, and of course for a longer time in the nutritive 
solution ; moreover, the germinal hyphae are from the first 
more numerous, and full of active, brilliant protoplasm, and 
branch soon and frequently. The septa are also more 
numerous and close-set. As before, I can describe all the 
chief phases by reference to a concrete example, drawn at 
the various stages. The spore shown in Fig. 14 was sown in 
a drop of Pasteur’s solution, where it lay at the edge, at 
7 p.m. on July 7th ; at 10 a.m. on the 8th it had germinated, 
and put forth the four hyphae exhibited in the drawing. At 
7 p.m. on the 8th, i. e. twenty-four hours after sowing, con- 
siderable changes had occurred, as shown in Fig. 15. In the 
first place, the hypha which took the lead in germination has 
grown but little, and already shows signs of exhaustion, while 
the two smaller hyphae have practically ceased to develop. 
All the energy of growth has, in fact, passed into the curved, 
upper hypha of Fig. 14, and this drawing was selected because 
it is so easily recognised through the various stages by means 
of the knee-like curve of the chief hypha. In Fig. 1 5 this 
hypha has grown to many times its former length, has 
branched considerably, and is full of protoplasm of the 
peculiar, brilliant, fine-grained, non-vacuolated character which 
distinguishes actively growing fungi. Only its basal segment 
is slightly vacuolated, as is also the spore. The particularly 
one-sided development of this young mycelium is not hard to 
explain : the spore lay, as said, at the margin of the drop of 
culture-fluid, and the fortunate hypha with the peculiar knee- 
like curve at its base happened to be pointing towards the 
