296 Trow. — Observations on the Biology and 
a fatty nature. More probably it represents a complex 
aggregate of oils and proteids. Its thorough chemical inves- 
tigation is much to be desired. Its origin has not been 
traced. 
Figs. 33 to 40 illustrate sections of germinating oospores 
drawn specially to show the behaviour of the nucleus at this 
period, sections showing the reserve globule being consequently 
excluded. In Fig. 33 the large nucleus is at rest and has a 
conspicuous nucleolus. The reserve globule is shown in this 
case for the sake of comparison. In Fig. 34 the nucleus is 
in the spirem condition and the nucleolus still visible. In 
Fig. 35 the nucleus is in metaphase and the chromosomes 
may be approximately estimated. At one end of the spindle 
six can be counted. Such nuclei are practically indistinguish- 
able from those seen undergoing karyokinesis in the sexual 
organs. It is not possible to make an accurate estimation 
of the chromosomes in each case, but the appearances all 
point to the numbers being approximately equal. In Fig. 36 
there are two nuclei undergoing division, and at this stage the 
inner wall of the oosphere is much thinner than before. The 
protoplasm obviously grows at the expense of the inner wall. 
In Figs. 37 and 38 we have further solution of the wall and 
division of the nuclei. 
In Figs. 39 and 40 the wall is thin and delicate, enclosing 
granular reticulate and vacuolated protoplasm and numerous 
nuclei. Six to eight nuclei may be counted in a single section. 
Additional nuclei would of course be found in the sections 
adjacent to those represented in Figs. 39 and 40, but not in 
those adjacent to the ones represented in Figs. 33, 34, 35, and 
36. Such sections of oospores as are shown in Figs. 39 and 
40 could not be distinguished from those of conidia but for 
the presence of the oogonial wall. It is especially noteworthy 
that at this stage, as represented in Fig. 40, some of the 
nuclei appear to be double. Careful observations show that 
the double condition depends upon the presence of two central 
chromatic masses (not nucleoli). The most obvious explana- 
tion of this is that the nuclei are undergoing more or less 
