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It is evidenced by American experiments with Egyptian cottons 
in Arizona, and by the very successful mill tests of Mr. Balls’s 
four pure strains, of which details are given. 
Purity of strain should be the principal objective of all 
cotton growers. 
It is suggested in the paper that arrangements ought to be 
made either at the Imperial Institute or in Manchester, perhaps 
preferably in Manchester, so that small quantities of cotton can 
be practically tested under conditions resembling those of an 
ordinary mill. In experienced hands a trustworthy test can 
be made with a pound weight of cotton or even less. If some 
such practical testing were regularly available it would greatly 
assist the scientific breeders and laboratory workers in cotton- 
growing countries, because they would not only be able to 
send small samples to be submitted to the test, but they would 
also be enabled to bring their laboratory experiments on single 
bolls and single fibres into closer relation with mill practice 
than is now possible. 
[ Discussion. ] 
The Cuatrman: Will any gentleman make any observations 
on the papers which have been read? : 
M. E. Lepuar (Director-General of Agriculture, Colonial 
Office, Belgium): My Lord—I have listened with much interest 
to the details given by Mr. McCall regarding his cotton- 
selecting experiments in Nyasaland. I understand that the 
Nyasaland cotton is really an American Upland cotton, and it 
seems that the cotton grown in Uganda is an American Upland 
cotton also—the Black Rattler, if I am right. Now we have 
been reading all that has been published on introducing cotton 
into Central Africa, and I would like to ask Mr. McCall if I 
am right in coming to this conclusion—that no other cotton 
than American Upland cotton has ever been a success in Cen- 
tral African Colonies. I believe that until now only American 
cotton has been successfully grown in Central African 
Celonies, and it would be very useful for us to know if that is 
correct. (Mr. McCatit: That is the case.) We are now 
trying cotton in the Congo under an American expert; he is 
doing very good work there, but it will be useful to know in 
what direction we shall have to work. 
Mr. J. PercivaL: My Lord and Gentlemen—I should like 
to emphasize some of the remarks which Mr. McCall has 
made in his very valuable paper to-day. I have been closely 
associated with him in the selection experiments which he has 
been carrying out in Nyasaland, and I must say the success 
