5 



Ft/MioATiON MACHINI 



Five more or less different machines have so far been proposed 

 involving the use of poisonous gases : the Ministry's original machine 

 and one proposed by M. ( Jayet, involving the use of carbon bisulphide ; 

 .Mr. Mosseri's and an adaptation of the American baled cotton 

 fumigator, employing prussic acid gas ; and, finally, a machine 

 proposed by Messrs. Wells and Hayman, in which the fumes from the 

 distillation of cotton sticks are iised as the killing agent. 



(1) The M/itix/i-// "f Aijricultiire's Carbon #/*////>// /We 

 A full description of this machine was given in the " Agricultural 

 Journal of Egypt," 1914, Volume I V. I 'art II, page 119. It is therefore 

 of little use repeating it here. Suffice it to s;iv that. 90 tar as the 

 treatment itself is concerned, this machine is the most successful of 

 any yet erected, giving a regularly con plete mortality of the worms 

 with no possibility of damaging the seed i>i any circumstances whatever. 

 The machine was verv cheaply erected. h;ul ;i capacity of tw-nty ardebs 

 per hour, and was economical in running, the only cing 



chemicals at less than I'.T. I per ardeb, and a small amount of power 

 and labour. The objections raised to the use of carbon bisulphide 

 on account of its poisonous find inflammable qualities were, however, 

 so strong that the machine was abandoned. 



For further particulars, see th> I to above or apply 



to the Ministrv of Agricultun . 



(2) Mosseri's Ci/nti/dc /''inu/nator. This machine has already 

 been referred to at some length above. The installation at KalY el 

 Zavat consists of eight cylinders, each with a capaciiv of about ten 

 ardebs, a powerful air pump worked by an oil engine for exhausting 

 the cylinders and the necessary apparatus for producing, drying, 

 and distributing the hydrocyanic acid gas. At first an apparatus 

 was also attached for recovering the gas after use by means of caustic 

 soda, but owing to ' he difficulties and dangers of handling this without 

 employing a trained chemist it was decided to burn the ifas after 

 use by passing it through a small fum 



In practice a cylinder is filled with seed and closed down. The air 

 is then exhausted a 3 possible. The gas, mixed with a certain 



amount of air. is admitted and left for half an hour to take el; 



