YEAST PLANT. 



299 



it smaller filaments with small bead-like bodies upon the 

 apex, piled one upon the other, or, more properly speak- 

 ing, strung together; these, again, are surmounted by 

 larger spores of a discoid shape filled with granular 

 matter, and others which are quite empty. Those of the 

 aspergillus are apparently without granular matter or 

 nuclei, and are more highly refractive. - The puccinia are 

 club-shaped, the very rapid growth of the spores and 

 spawn of which appears to exert a specific and peculiarly 

 exhaustive action over the tissues of the plant on which it 

 feeds. Plate I. No. 12, represents a portion of the mould 

 taken from a saccharine solution. 



The yeast plant, in its most perfect condition, is chiefly 

 made up of globular vesicles, measuring, when fully 

 grown, about the jj^nrth. of an inch in diameter. The 

 older cells are filled with granular or nucleated matter ; 

 the nucleus rapidly increases, and nearly fills up </he parent 

 cell, which then becomes ovoid, and ultimately the young 

 cell buds out and is separated from the parent. Some- 



Fig. 159. A diagrammatic representation of the development of the Yeast PUnL 



So. 1, Fresh Yeast: No: 2, one hour after adding it to wort; No. 3, three 

 hours ; No. 4, eight hours ; No. 5, third day, after which jointed filaments 

 are produced. 



times other and smaller ceils are formed within the young 

 'one before it leaves the parent globule. This process goei 



