<0 Bulletin (le Id Sociclv lùìloinologiqiie d'Eijypte 



2) Tlu' lime rcujiiiied to pass through the machine. 



3) The temperatine the maeiiine isreguhited to give. 



4) The temperaliire ol" the seed at the exit. 



A few deductions are fairly obvious, 



The principle underlying the working of the maclii- 

 ne is to heat the seed enough to kill the worms, hut not 

 to injure the seed. 



The worms apparently die at a temperature some- 

 where near 50'Mhe seed not till it has reached a tempera- 

 ture of about 'oh'\ If it were possible to make tlie machine 

 have a uniform tenij)erature ofóO'^ and to allow the seed 

 sidiicient linu^ to reach this temperature, all worms 

 would be killed without any injury to the seed. 



In order to economise time and to increase the out- 

 put the time allowed for the passage is shortened to some 

 prearranged unit. The time is then left unchanged and 

 the temperature regulated in such a way as to ensure 

 that the seed shall be sul)jecled to sufficient heal to 

 bring its internal lemperaluie somewhere between 

 the critical temperature for the worms and for the seed. 



In our experiments the lime allowed has been \) mi- 

 nutes, 7 minutes and f) minutes. It is intended to test 

 3 minutes as soon as circumstances permit. 



The following data were obtained in winter weather 

 (temperature 10-2.)"). 



At 9 minutes s[)eed, the usable lemperatures have 

 been found to lie between 7ô-(^'(J" and 85-90". That is to 

 say 7.')° killed %% of the worms. Sii" kills 11)0'^ of the 

 worms, <S.V' does not yel alfect Ihe seed and UÜ" can 

 be reckoned to kill about 10% of the seed. 



At 7 minutes speed the usable temperatures lie be- 

 tween 85-90- and lOO-lOô". 80" killing 98 X of the worms, 



