76 University of California Publications in Agricultural Sciences [Vol. 3 



dissolves. This occurs in the cultures having 2.2M KC1, 1.2M, MgCL, 

 .7.M CaClo, and .2M NaCl respectively. At lower concentrations there 

 is a degenerated condition, various shapes occurring, as shown in 

 figure C. Such diseased cells show a heavy black membrane, especially 

 in the case of CaCl, and NaCl, with transparent cell-illusions or black 

 spots within the cells. Moreover, they vary in size. This variation 

 in size occurs also with KC1 and MgCl 2 , but in these cases the yeast 

 cells are larger than with CaCl 2 and NaCl. In all instances, as the 

 concentration of salt increases beyond the favorable degree of con- 

 centration the cells become smaller and smaller until finally, in the 

 extreme concentrations, they dissolve. Table 5 (a. b, c, d) and the 

 curves in figure 5 (a, b) show the effect on the size of yeast cells in 

 different salt solutions. 



