294 



Mr. E. E. GREEN : Mr. Chairman Dr. Cough's paper has 

 interested me very much, because I had some interesting ex- 

 periences in Ceylon in connection with the very limited cotton 

 cultivation that has been carried on there. I should like to ask 

 him whether he does not think that the Gelechia gossypiella 

 might possibly have been already present in Egypt on some 

 of the other plants which have been grown there for a great 

 number of years. 



Dr. COUGH : I think it must have been introduced within the 

 last ten years. There are a number of enthusiastic entomo- 

 logists in Egypt, and quite a number of old collections, and I 

 think that had the insect been in the country it must have 

 been found. At all events it has only become common in the 

 last few years, and there seems to be no evidence that any of 

 the insects had been taken prior to 1910 in Egypt. 



Mr. GREEN : Did I understand you to say that carbon disul- 

 phide had no effect on the larvae unless the vapour was 

 circulated through the seed ? Carbon disulphide is usually con- 

 sidered such a very useful remedy, and, the vapour being 

 heavier than air, it is supposed to be sufficient to put the liquid 

 in an open vessel on the surface of the seed to be treated. 



Dr. GOUGH : That is quite contrary to our experience. As 

 soon as we circulated the carbon disulphide vapour there was 

 no difficulty in killing off the larvae. The circulation of the 

 vapour was maintained by means of an air pump. 



Mr. J. W. McCoNNEL:. At what time in the year do you see 

 these insects in the growing crop? 



Dr. GOUGH: The first moths come to life about July; after 

 that we take moths continually till January. 



L1S SELS NUISIBLES ET LE COTONNIER EN EGYPTE. 



Par VICTOR M. MOSSERI, 







Membrc de I'lnstitut Egypfien. 



[ABSTRACT.] 



De ce que le cotonnier vegete, dans la partie septentrionale 

 de 1'Egypte, sur des terres qui renferment des doses assez 

 elevees de sels nuisibles dans les soixante ou quatre-vingt-dix 

 premiers centimetres de profondeur, on en conch.it d'ordinaire 

 que cette plante manifeste a Tegard des dits sels une grande 

 resistance. On est alle jusqu'a admettre, que la presence dans 

 le sol de i a i'5 pour cent de chlortire de sodium, n'avait aucun 

 effet -defavorable sur le cotonnier, tant au point de vue de sa 

 vegetation que de son rendement. 



Ayant depuis longtemps reconnu 1'erreur d'une telle opinion 



