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isting T'.'ithin a country. Eventually this work must result in the 

 destruction of diseases to such an extent that the prohihltion of 

 the export of diseases - now apparently so difficult a measure - 

 would resolve itself into a praoticahle and comparatively simple 

 one. 



It will be q_uite realised that whatever the changes are which 

 may he efiected to improve the existing systems, that time and ex- 

 perience only '■'i'ill insure the exi";ected henefits in their full degree. 

 This policy would serve well a douhle purpose - the control of ex- 

 isting diseases, and the assurance of heing protected frcn wilful 

 invasion from without. 



The control of all kinds of diseases within each country should 

 he its most erneet aim, and would naturally result in increasing 

 the confidence in the trade and commerce with ones neighbors, pre- 

 serve peace and encourage closer relations among all nations. 



It may he argued that the prohibition of the export of 

 diseased vegetation would be as im;,.racti cable as the prohibition 

 of the import, and I have myself, just pointed out how inade(iuate 

 such measures may be, but we must not forget that generally vegetable 

 imports take place during a comparatively short period, at riiich 

 it must often bedecided in haste when working under severe pressure 

 from shipments arriving in port in large numbers, whether a par- 

 ticular shipment is free or not from diseares, whereas in the 

 carrying out of exportation prohibition, the standing field crops 

 of a country could have been' carefully surveyed and certificates 

 have been issued af to their freedom, or the freedom of entire 

 countries or areas within it from certain diseases. A well or- 

 ganized cystem of thlf kind must result in the desired object in 



