- 23 - 



advantage of heating by radiation instead of by direct contact with 

 steam-pipes is that there is less danger of overheating individual 

 seeds. The disadvantage of it is that it necessitates a very much 

 larger heating surface for the same output. Thus the Domains' 

 machine and Simon's machine, in which the surface of the steam- 

 tubes must lie verv approximately equal, had outputs of about 

 one-fifth of an ardeb and fourteen ardebs per hour respectively. 

 The heating surface of the steam-lubes in the Domains' machine 

 was not arranged so as to give its maximum effect, but even if it 

 were so. the difference between the two would still lie very great. 



For further particulars apply to .Mr. I'anavoti Matsouchis. c o 

 Messrs. J. Plant a A: Co.. Mansura. 



(/) MACHINKS i.\ WHICH TIIK SKKD is HKATKD i:v DIMK.CI CONTACT 

 WITH MKTAI.I.IC UKATINC Sn;r.\< 



(11) AV///O//.S MddiiiH'. This machine has already been referred 

 to several times above and formed the subject ol a. special report 

 in the Ministry of Agriculture's Bulletin No. 11. It consists of a 

 horizontal cylinder which is kept nearly full of seed, which is fed 

 in at ow end and withdrawn a.t the other. The seed is kept continually 

 in motion bv a. revolving framework which carries a number of 

 longitudinal steam-tubes |>\- means of which the seed is heated. 



An account of a. number of experiments with this machine are 

 given in the report referred to above. Kigures from later trials are 

 given in the tables on pa^es !t and \'2 of tin- present report. As 

 regards practical trial.-, asap.-irt from scientific tests, on December 14. 

 1916, and the succeeding days. 100 ardebs of seed were treated in 

 this machine by a mntiirni from the Kntomological Section who 

 had had no previous experience of handling the machine. Twenty 

 five samples taken at random from the treated seed showed an average 

 of 96 per cent pink boll worms killed and an average germination 

 of 86 per cent as compared with S7 per cent in the untreated seed. 

 A little experience in running the machine and the fitting of better 

 controls should make it easy to improve very considerably on these 

 figures. T(it/<iir> seed treated for .Mohammed Bev Kftla.toun and for 

 the State Domains Administration is reported to have been quite 

 up to the normal a.- regards both the germination and the subsequent 

 growth of the plants. 



