The Nucleus of the Yeast-Plant. 
BY 
HAROLD WAGER. 
With Plates XXIX and XXX. 
Literature. 
HE following interesting observation was made by Nageli 
J- in 1844 concerning the nuclei in the cells of Fungi: 
4 Structures resembling nuclei may be detected here and 
there in the cells of the Fungi. The fermentation-fungus 
in the must of Wine and in Yeast often exhibits a little 
nucleus of whitish mucus, lying on the membrane, regularly 
in each cell.’ 
This is the first reference made to the presence of a nucleus 
in the Yeast-cell. It may perhaps be doubted if Nageli had 
before him the body known to recent observers as the nucleus ; 
but it is interesting to find that under certain conditions 
the nucleus can be observed in the fresh condition of the 
cell, and is always in the position indicated by Nageli. 
Five years later the nucleus of the Yeast-plant was made 
the subject of investigation by Schleiden (’49), who applied 
reagents to determine its presence. In his work he states 
that, on treating Yeast with ether, alcohol, or potash, one 
[Annals of Botany, Vol. XII. No. XL VIII. December, 1898.] 
