402 MORPHOLOGY. 



traced the development of these completely in this way in our indige- 

 nous Conifer ce, particularly in Pi?ii(s, Abies, Larix, Taxus, Thuja, 

 Juniperus, &c. In the young cells in the embryo-sac a circulation with 

 reticular currents very often occurs (e. g. in Ceratophyllum, Nymphtza, 

 Nuphar, Pedicularis, &c.). I have described the peculiar forms of this 

 in Ceratophyllum, at length, in the Linnaen. 



III. Of the Transformation and Development of the Parts of the 

 Flowers into the Fruit. 



163. Through manifold changes the individual parts of the 

 fruit are developed out of the flower. The commencement of all 

 these processes is, however, principally (in the natural conditions of 

 plants, as wild, always?) connected with that circumstance which 

 has hitherto been usually called the fecundation of plants. Here we 

 have nothing to do with the explanation and signification Q$ the phe- 

 nomena therein occurring, but with the morphological develop- 

 ment, which comprehends the four following sections: A. The 

 change of place and development of the pollen to the embryonal 

 globule. B. Development of the embryonal globule into the em- 

 bryo. C. The perfecting of the germen and seed into fruit and 

 seed. D. The phenomena exhibited in the other parts of the 

 flower during these processes. 



A. THE CHANGE OF PLACE AND DEVELOPMENT OF THE POLLEN 

 TO THE KMURYONAL GLOBULE. 



164. As soon as the pollen is completely formed and the cells 

 of the anthers have dehisced, the granules are brought in some 

 mode or other, sooner or later, in the LoranthacecB to the nuclear 

 papilla, in the Conifers and Cycadacece to the micropyle, and in 

 other plants to the stigma; or lastly, in the Asclepiadacece and Apocy- 

 nacece, to the points of the stigmatic body which take the place of the 

 stigma. There the granules lie for a variable time, then swell up 

 somewhat, and the pollen-cell grows out gradually at one point of 

 its periphery into a filiform cell (tubus pollmis, tube pollinique, 



ble (but begun much too late) researches to Meyen's excellent essays, but without en- 

 tering at all into Meyen's facts, says, "If Meyen had continued his researches far 

 enough, he would have seen his error." The very reverse, applied to DeCaisne's, would 

 have been a just criticism. Link imagines that Meyen has not thdught of the peri- 

 carpium, the berry. Has Link here thought of the juicy, berry-like seed of Punica ? 

 As if the pedicel in which an embryo has been formed may not become berry-like and 

 juicy as the pedicel of Anacarditcm, which contains no embryo. 



e, corpuscula (R. Br.); </, simple integument; g, micropyle. D, Upper part of the 

 embryo-sac seen from above : three orifices are perceived, formed of larger cells, cha- 

 racterised by the cytoblasts lying exactly externally. C, Upper part of (he embryo- 

 sac in longitudinal section, c, Embryo-sac; e, corpusculum (R. Br.); another, on the 

 right side, shows through the cellular tissue, which fills the embryo-sac. 



