MICHIGAN ACADEMY OF SCIENCE. 

 TABLE X.— FUNGICIDAL VALUE OF 1-50 BARIUM POLYSULFIDE. 



105 



Average germination for tests with this strength of spray was 

 found by the above to be 89%. 



Since the checks run with these experiments show a germination 

 of only 92%, it is apparent that the dilution used would not be 

 likely to prove effective. 



BARIUM POLYSULFIDE TESTS. 



1-40 dilution. 



This dilution was made by taking 1 gm. of the material and 

 billowing it to dissolve in cold water. 



TABLE XI.— FUNGICIDAL VALUE OF 1-40 BARIUM POLYSULFIDE. 



Average germination for the tests with a 1-40 dilution of this 

 spray 89%, which indicates very little fungicidal property for 

 this dilution, in the case of Cladosiwrium cucumerinum, since the 

 checks show a germination of only 92%. 



One effect of this chemical was very noticeable, however, that 

 being the delaying of germination. All the spores were examined 

 at the end of 3G hours and at this time most of those which germi- 

 nated at all had developed a good sized germ tube. In the case of 

 the spores placed on the cover glasses sprayed with this solution 

 however, the germination was noted well begun before 40 hours al- 

 though it proceeded at a normal rate after that time. 



