STRUCTURE OF THE YEAST-CELL 



BY 



/ 



L. ERRERA (') 



A study of the cells of Saccharomyces Cerevisiœ has led me to the 

 following conclusions, part of which merely confirm former 

 researches : i. A relatively large nuclear body exists in each adult 

 cell. 2. Young cells contain no such body; a little later the old 

 nuclear body divides, and one of its two daughters wanders 

 through the narrow connecting-channel into the young cell. 

 3. After ihe division is complete, the two cells are still kept 

 together by a mucilaginous neck-shaped pedicel, which appears 

 not to have been noticed hitherto. It may persist or not, thus 

 explaining the occurrence of cell-chains or of isolated cells in 

 different races of Yeast. 4. Carbohydrates are stored up in Yeast 

 in the form of glycogen, which accumulates or disappears from 

 the vacuoles very rapidly, according to conditions of nutrition 

 and growth. The colour given by a known quantity of iodine- 

 solution to a known amount of Yeast-culture shows these 

 variations most sharply. The change of tint by heat after iodine- 

 action, and the destruction of the intracellular glycogen by saliva, 

 also give very clear results. 



(I) Cette note a paru dans Annals of Botany, décembre 1898^ et dans British 

 Association Report, 1898. 



