HYBRIDIZATION 10-8 



with some of the desirable characteristics of S. cerevisiae by mix- 

 ing the ascospores of both S. cerevisiae and S. carlsbergensis in a 

 broth tube containing only melibiose as a source of sugar. Plating 

 out the cell suspension from such a mixture should give some hy- 

 brids with the required desirable characteristics of both species. 



