13 



ginning. Tiie years 1912 to 1916 were occupied in preliminary 

 research with a view to finding a practical method of doing this. 

 In 1916, when satisfactory machines were found for the purpose, 

 the erection of such machines was made compulsory in all ginneries 

 On account of the war, however, great difficulty was experienced in 

 obtaining them. In the winter of 1917 to 1918 enough were obtained 

 to treat the greater part of the seed used for sowing in Upper Egypt ; 

 in 1918 to 1919 all the seed in Upper Egypt and a small quantity 

 in Lower Egypt was treated ; and during the 1919-1920 season the 

 whole of the seed in the country has been treated. .. 



The two machines principally used in this work were " Simon's " 

 and the " Delta." These are fully described in Bulletins Nos. 11 and 

 14. Of the former type twenty-one were erected in Upper Egypt 

 and forty-six in Lower, while of the latter type the corresponding 

 numbers were three and thirty-five. In addition two machines 

 of a new type, the " Jafforti," which is very similar to the " Delta," 

 have been erected in Lower Egypt, making the total for the whole 

 of Egypt 107. 



The percentage of worms killed by these machines as shown by 

 the very numerous samples examined by the Entomological Section 

 is given in Table VII. 



TABLE VII. 



'All these samples were also tested for germination, during the 

 1919-1920 season nearly eleven million seeds being germinated, and 

 as a result one can say absolutely definitely that if excessive tem- 

 peratures, i.e. over 70 C., are avoided, no harm whatever is done 

 to the germination of the seed. A few surprisingly few complaints 

 have been received of bad germination in the field, but in most of 

 these cases it was obviously due to unfavourable weather, bad cultiva- 

 tion, or low quality seed, and in not a single case was it definitely 

 proved to be the result of the heat treatment. 



* These figures are probably lower than the actual average owing to the fact that many 

 more samples were taken from the. smaller ginneries, which did not always work satisfactorily, 

 than from the larger ginneries. 



