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frequent intervals by septa, especially in the older portions; the septa, 
however, seem in no way connected with the position of the branching 
hyphe. The young filaments, which are usually filled with protoplasm 
that is transparent, sometimes contain a thread of protoplasm which is 
highly refractive and which shows no vacuoles. It is possible that it is 
this thread of refractive protoplasm which, in rounding off and becoming 
denser, produces the small spore-like bodies which are found in the my- 
velial cells. 
The question of the reproductive methods of the red mould has been 
the chief source of difficulty in its study, and so far as the work has been 
‘earried these methods have not been fully determined. 
As regards the formation of conidiophores this mould is markedly dif- 
ferent from the commoner ones. In spite of the most favorable vegetative 
conditions having been given, both as to the kind of nutritive solution used 
in the moist chamber, and as to the temperature, no conidiophores have 
been discovered. A kind of division into cells, which is perhaps analogous 
to the formation of conidia in other moulds, takes place (Fig. 1), but ob- 
servations as to the true significance of the division are not complete. The 
nearest approach to the formation of conidiophores is in the hypha shown’ 
in Fig. 2. Here a rounding takes place in the terminal cell and the hypha 
back of this rounding is divided by an extraordinary number of septa. 
However inadequate the determination of vegetative reproduction, 
proofs of sexual reproduction have been more abundant. The red specks 
to which I have referred as being so thickly distributed over the surface 
of the gelatine cultures occur also in the tube cultures and in the moist 
chamber. When a culture is examined under the microscope, these specks 
are seen to be dense, irregularly shaped bodies of extremely varying sizes. 
(Fig. 3). Some are many times the size of others which have apparently 
reached the same stage of maturity. They are formed by the interlacing 
of the filaments and are found completely developed in so short a time that 
it has been impossible to secure the intermediate stages for photographing. 
As the interlacing of the filaments goes on, the massing becomes denser 
at some points than at others, and here these rough, compact, tuberous 
bodies are found. (Figs. 3, 4, and 5.) Unfortunately their thickness prevents 
their successful photographing (since it is impossible to focus with the 
microscope on more than one plane at a time). These bodies conform to 
a certain extent to the description of sclerotia but their function is evi- 
dently not that of a resting body formed under adverse conditions. On 
