Excerpt from Contribution to the Knowledge of the Morphological Value and the Phylogeny of the Ovule and Its Integuments: Proefschrift The question about the morphological value of the ovule, has long been the subject of investigation and discussion, but a decisive answer is stil waited for. The first step to be done in order to throw light on this problem, is to determine to which category of organs, shoot, root or leaf, it can be classified as a whole. Especially during the nineteenth century there has been a good deal of disputing about this subject and nearly all morphologists have occupied themselves more or less with this question.
Finely their conceptions and Opinions settled on three theories, which are to be mentioned later on, but nobody could give such convincing arguments, that one theory was accepted every where.
Gradually, however, the botanists have adopted the principal idea of one of those theories, and now - a-days it is generally granted, that the ovule is borne by a leaf, at least belongs to it, but a correct interpretation of the nature and the origin of both integuments and the nucellus is very little certain.
The investigations concerning the ovule started from the conditions of the Angiosperms and in order to state the nature of nucellus and integuments, five different methods were used, viz. The ontogeny, the anatomy, the topographical-morphology, the phylogeny and the teratology.
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