Dans cet ouvrage, Morren et Deville présentent les résultats de leur étude approfondie sur les processus végétaux tels que la feuillaison, la floraison et la maturation des fruits et des graines. Grâce à leurs observations effectuées au cours de l'année 1841 dans les jardins botaniques de l'université et dans les environs de Liège, ils ont pu proposer de nouvelles considérations sur la biologie des plantes.
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