74 Camillo Karl Schneider: Morphologie der Gewebe (Anatomie). [74 



Verff. geben folgendes Resümee: 

 ,.1. Even the delicate walls of the endosperm cells are pitted in mucb the 

 same way as the wall between the egg cell and jacket layer of the 

 endosperm. 



2. In addition to starch large numbers of protein granules are present in 

 the endosperm celis of Ginkgo and Oycads of quite the same character 

 and appearance to those in the egg cell. 



3. A final pit closing meinbrane is present in each pit between the 

 egg cell and jacket cells, and this membrane as well as the thickened 

 portion of the pits of 2 nd and 3 nd Orders are perforated only bv 

 plasmodesmen. Then any big open communication between egg cell 

 and jacket cells is positively denied. 



4. In no case have any wandering nuclei of the jacket or endosperm cells 

 been observed; and even after the development of the embryo has 

 already begun, the jacket cells nuclei retain their integrity. 



5. As it wonld be absurd to suggest that starch travels as grains from cell 

 to cell, so it is pointed out to be equally absurd to say that the protein 

 grains do this, either between two cells of the endosperm, between 

 endosperm cell and jacket cell, or between jacket cell and egg cell. 



6. It is suggested that the jacket cells are glandulär or secreton^ and 

 render the storage food of the endosperm soluble and available for the 

 developing egg. At the same time their possible activity in the syn- 

 thesis of food staffs of higher Compounds from the supply of simpler 

 forms is not to be disregarded. 



7. The fact that the jacket cells are less differentiated in some of the 

 higher Gymnosperms than in the Cycads and Ginkgo niay be corollated 

 with fact that in their ovules there is verv little or no storage of solid 

 food staffs in the endosperm near the growing egg cell, the jacket cells 

 have . • . less work to do than in those (Cycads and Ginkgo) where there 

 is a large deposit of stored food round the undeveloped egg. 



8. The weil developed jacket cells of the Gymnospermic prothallium are 

 considered the phylogenetic homologues of the Angiospermic antipodals, 

 and attention is drawn to the similar function performed by them and 

 the activ Antipodais of some Angiosperms described by Westermaier 

 and others. 



9. Transitory small grained starch has been detected in the egg cells of 

 Cycads, Ginkgo and Pinus and fouud in association with the protein 

 grains and even in the nutritive vacuoles. 



10. So far as we could see, the granulär contents of the nutritive vacuoles 

 have no nuclein among their constituents as in most cases they do not 

 stain with acetic methyl green. 



11. The chemical nature of the nucleoli and protein grains is fouud to be 

 different, as shewn by the results of digestion experiments, supporting 

 one view of their different origin. 



12. It is proved that the ,Hofmeisterschen Körperchen' are not nuclei, and 

 we think it unlikely they are intimately connected with nuclei. We 

 suggest that they may be digestive vacuoles comparable in origin and 

 function with the digestive vacuoles of lower organisms, which are 

 formed as required round the temporarily deposited food in the egg 

 protoplasm." 



