On the Longevity of certain Species of Yeast. 



355 



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On the Longevity of certain Species of Yeast. 

 ^ By Arthur E. Ling and Dinshaw Eattonji Nanji. 



(From the Department of Biochemistry of Fermentation, University of Birmingham.) 



(Communicated by Sir Edward Thorpe, F.E.S. Received July 7, 1921.) 



In the autumn of 1918 Dr. J. J. Hood handed to one of us (A. R. L.) eight 

 cultures of yeast, belonging to the late Mr. A. Gordon Salamon. The cultures 

 in question, it appears, were given to Mr. Salamon by the late Prof. Hansen 

 in 1887. They consisted of Freudenreich flasks, containing wads of perfectly 

 dry cotton-wool. The flasks were furnished with a side tube and there was a 

 tube at the apex of each hollow stopper. There was a cotton-wool plug at 

 the opening of each flask inside the hollow stopper, and the tube at the ap^x 

 of the stopper was plugged with cotton-wool, as was also the side tube. In 

 addition to this, the cotton- wool plug of the side tube was coated with 

 sealing-wax and the hollow stopper was also fixed on with a ring of sealing- 

 wax. Each flask bore a label, giving the name of the particular yeast and 



