352 WWLES DE LA SCIENCE AGRO.NOMIOl E 



Je prie Mr I). W. Cl ii. eh. chef du laboratoire de Prolozoo- 

 logic de Rothamsted, do bien vouloir trouver ici l'expression de 

 ma plus sincère reconnaissance, pour son aide et ses conseils, 

 tant au cours de mes stages detudes dans son laboratoire, rpie 

 pour la rédaction de ce travaH. 



BIBLIOGRAPHIE 



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