(2) Formalin. The seed is immersed in a half per cent solution 

 of commercial formalin (i.e. ing 37 to 40 per cent formaldeh\ cle) 



for two hours, thei I out on the ground and allowed to dry 



rapidly in the sun. The remarks made above with r to the 



removal of floating seed and spore-sacs apply in this case also. The 

 seed should then be sown as soon as possible. 





COST OF TREATMENT. 



Formalin. -Four or five qadali* of millet seed are usually sown 

 per fedddti in Egypt. Four qad/ts .ire equal to eight lit that 



ten litres of the solution will be ample for treating sufficient seed for 

 one fcdddn. A half per cent of ten litres is 50 c.c. and this is the amount 

 of formalin required. Commercial formalin (i.e. containing 37 to 40 

 per cent formaldehyde) when bought wholesale costs P.T. 55 per 

 litre. Thus the cost of treating the seed with formalin is P.T. 2-75 per 

 fedddn. If the solution is used for a second lot of seed tin's will of cpi 

 reduce the cost of treatment to M ms. 1 1 per fed. [sot >n. 



Cop/ier Sulphate.- Copper sulj. .ughtat P.T. 15 per 



kilo-. ::00 gr;:;. the amount n< for 



of -2 i I'.T. 3. Three 



cultivators HSH, sullicic fur 

 one /'. !y shari; !'.T. I each. 



The methods of seed disinfection described above were demon- 

 ted this ve.irin twelve diffe v l ! '- Kaei> h.t of . 

 divided into tliia ^wn untreated, 

 with two per cent copper sulphate, and the 



third sown after ti. /, ith half i formalin. The result 



showed that the chemical had no ill efi niination of the 



seed. In all the treated and i: present 



showing that disinfection of seed is inelTective against .! nut. 



1 Smut did n<,< occur in any of i led or untreated pi 



In eleven out of twelve experhi iain Smut was also absent, but 



in the twelfth it appeared in the untreated only. Th- no 



Grain Smut in the treated plois of this experiment. This sla 



treatment of seed with copper sulphate or formalin is effective 

 insl < irain Smir 



BIBLIOGRAPHY. "Fungi and 1 n 1'h'nts." BUTLER. 



