532 



PROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



Table XV. — Variation in the Percentage of Lint of Sakellaridis, Assili and 

 Affifi Cottons ginned by the State Domains during the years 1911- 

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

 ministration. 



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. — Ghezireli — 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 boU 

 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. 



