310 



DR. L. H. COUGH. 



on the moment when this transition sets in. In 1917 it started earliest in Menufia, 

 Galiubia, Gizeh and Beni-Suef. Average percentages of 25 per cent, sound bolls 

 or under were first recorded from Sharqia, Menufia, Galiubia, Gizeh and Beni-Suef. 

 They were reached latest in Keneh and Girga, and never by Aswan. The damage 

 done to the crop depends to a considerable extent on the time (which can be gauged 



Table XIX. Showing Comparison of Grouping of Samples of Green Bolls. 



Locality. 



Percentage of Observed Samples with Sound Bolls. 



100-76%. 



75-51%. 



50-26%. 



25-0%. 



Delta 



Gemmaiza 

 Wadi Tumulat 

 Middle Egypt 

 Upper Egypt .. 

 Armant 



52 

 46 

 44 

 52 

 65 

 66 



13 



19 



15 



7 



6 



11 



8 

 12 



6 

 10 



9 



6 



27 

 23 

 35 

 32 

 20 

 17 



Week 



12 13 14 IS 16 17 IS 19 



sound 



Perce n ta a eot\">°-' 5 ° / %\ li ! 1 i 1 i " Jj ° ' 25% \ Percentage oP Percentage o A 50 '* W&W,. I 50 ' 75% ^Percentage of 

 bolls ] 75 . 50 % H Hjg£igi.c5-so%J attacked bolls. sound bolls\ 2 s - i°A lS||Sj8S£X^ 7S-iOo%\ a ttacked bolls. 



Fig. 6. Diagram to show the progressive increase of Gelechia attack per province 

 (Mudirieh); week 1 commenced on 2nd June, 1917. 



by the number of observed percentages) spent on the average in any of these 



groups. For example Table XIX shows that the damage done in the Delta was 



very nearly the same as that done in Middle Egypt (Giza, Beni-Suef, Fayum). 



Further that both were considerably worse than Upper Egypt. 



