Dans cet ouvrage, Morren et Deville pr sentent les r sultats de leur tude approfondie sur les processus v g taux tels que la feuillaison, la floraison et la maturation des fruits et des graines. Gr ce leurs observations effectu es au cours de l'ann e 1841 dans les jardins botaniques de l'universit et dans les environs de Li ge, ils ont pu proposer de nouvelles consid rations sur la biologie des plantes.
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