532 



I'ROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



Table XV. — Variation in the Percentage of Lint of Sakdlaridis, Assili art^ 

 Affif, Cottons ginned by the State Domains during the years 1911- 

 1917, calculated from figures supplied by the State Domains Ad- 

 ministration. 



Sakel2=0-8 



For all varieties combined2=0-6 



Aasili2; = 0-5 



AffifiS =0-i 



19.— EXPERIMENTS IN EGYPT ON THE SURVIVAL OF THE 

 PINK BOLLWORMS (RESTING STAGE LARV^?;) IN RIPE. 

 DAMAGED COTTON BOLLS BURIED AT DIFFERENT 

 DEPTHS. 



By F. C. WiLLCOCKS, Entomologist to the Sultanic Agricultural Society- 

 Cairo, Egypt. 



Locality. — Ghezireh — an island in the Nile, opposite Cairo. 



Soil. — A sandy loam. 



The ground had been flooded September-November 1916 by infiltra- 

 tion from high Nile. 



Pits were made 5 cm., 10 cm.. 15 cm., and 20 cm. in depth. 



The bolls were " planted," i.e., there was a space between each boll 

 and its neighbours. The soil was then put back into the pits and trodden 

 down. Not all the soil which had been taken out was got back into 

 the pits. 



Bolls were buried about the second week in January 1917 — much 

 later than had been planned, but owing to infiltration the soil was not 

 in a fit state before this date. 



