322 Wager. — On the Presence of 
The observations on plant-cells which have been made up 
to the present time point to the existence of centrospheres 
as independent units of the cell originating in the cytoplasm, 
inasmuch as they are always found outside the nucleus and 
undergo division on their own account. In animal cells, on 
the other hand, they are often found to originate in the 
nucleus, and it is possible that future observation will show 
that even in plants the centrospheres are sometimes of nuclear 
origin. We will, however, refer to this question again later. 
Centrospheres have not yet, so far as I am aware, been 
discovered in the cells of Fungi, if we except Gjurasin’s 
observations on radiating striae at the poles of the nuclear 
spindle in an Ascomycete 1 , and my own observations on 
the small centrosome-like body at the poles of the spindle 
in certain Hymenomycetes 2 . But recently, while working at 
the nuclei in the basidia of Agaricus (Mycend) galericulatus , 
in order to confirm the facts of nuclear division which had 
been discovered in other Hymenomycetes, I observed con- 
stantly a peculiar body (sometimes two) of somewhat large 
size, in connexion with the large nuclei of the basidium. 
This puzzled me for some time, and I at first thought it was 
merely an accidental occurrence due to some change produced 
by my method of preparation ; but its constant appearance, 
regular size and definite staining properties led me at last 
to suspect that this body was a definite structure belonging 
to the cell and intimately connected with the nucleus. On 
making more careful observations I came to the conclusion 
that it was archoplasmic in nature and had to do with the 
formation of the centrosome-like body and spindle-figure, 
which are found in this fungus, and which had been already 
discovered in other Agarics. The following account of these 
structures will perhaps serve to elucidate somewhat their 
nature, and will give readers of this paper, who are interested 
in these bodies, an opportunity of judging whether my surmise 
1 Ber. der dent. bot. Gesell. 1893. 
2 Annals of Botany, Vol. vii. 1893, p. 489. 
