I30 



Field Experiments. 



Table VII. — Fungusine and Phenol compared with Bluestone and 

 Formalin as Fungicides. 



Grains 

 Sown. 



500 

 500 

 500 

 500 

 500 



Grains 

 Germinated. 



405 

 363 

 339 

 355 



■128 



We are now in a position to compare the relative effects of fmigusine, 

 bluestone, formalin, and phenol, when used as a dressing for bunt-infected 

 seed, and it will be convenient for purposes of comparison to fix the numerical 

 relation between the effect of treatment with a particular substance and that of 

 untreated seed. Thus, in the case of fungusine, there was 88 per cent, of bunt 

 in tbe untreated plot, and 19.2 per cent, in the treated plot, so that if the 

 one is divided by tbe other it gives the numerical relation between the two 

 and fixes a standard of comparison -jl^^r = -4.5. This number represents the 

 factor or co-efficient of efficiency for fungusine. 



If the other treatments are dealt with in the same way then the follow- 

 ing is the result : — 



Co-efficients of Efficiency. 

 Bluestone . . . . . . . . 40 



Formalin.. .. .. .. ..10.7 



Phenol .. .. .. .. ..5.4 



Fungusine . . . . . . . . 4.5 



Thus, bluestone is nine times more effective than fungusine in the preven- 

 tion of bunt, and even phenol, when used alone, without the other ingredients 

 entering into the composition of fungusine, is slightly more efficacious. Apart 

 altogether from the relative efficiency of the various substances used, the fact 

 stands out prominently of the great saving effected in comparison with no 

 treatment at all, although, of course, no intelligent farmer would ever dream 

 of sowing such a smutty sample of seed. 



The different Species and Sub-species of "Triticum" in relation to 



Bunt. 

 In the quest for a smut-resistant wheat to be used as one of the parents 

 in crossing, the necessity for testing different kinds is evident. Accordingly, 

 I obtained from Germany samples of all the known cultivated species and 

 sub-species, which are classified by Hackel, as follows : — 



' monococcum L., Einkorn or One-grained Wheat. 

 idieoccum Schrank, Emmer. 

 \speUa L., Spelt. 

 sativum Lam. ( Cvulgare VilL, Common Wheat 



Triticum 



. tenax 



compactum Host, Club or Dwarf 



Wheat. 

 turigdum L., Poulard or Rivet 



Wheat. 

 durum Desf., Durum or Hard Wheat. 



folonicum L., Polish Wheat. 



