On the development of the Sporce of Anthoceros Icevis. 83 



its walls the whole of the mucilaginous mass forming only a 

 thin layer, and as, if these were true cellules, not only the 

 contour of these circles and polygones, but also their faces 

 should be formed of the same granular substance, while 

 those appear absolutely diaphanous ; it is perhaps more pro- 

 bable that this mucilaginous substance only forms a layer 

 on the internal wall of the mother-cellule. This layer in 

 some points is very thin, or absolutely interrupted ; in others 

 it is thicker, and by this property manifests a retiform cellular 

 organization. 



It is not possible even by the use of iodine, which tinges 

 this mucilage yellow, to demonstrate the presence of cellular 

 formation. 



The nucleus does not take part in this formation; fre- 

 quently it is so concealed under the green granular mass, 

 that it is imperceptible, or almost so ; at other times how- 

 ever (fig. 3,) we find it placed by the side of or between the 

 two divisions of the green mass, and is there seen with more 

 facility ; we remark at the same time, in this case, that the 

 nucleus has remained the same, and that it was quite 

 separate from the above mentioned mucilaginous formation ; 

 this latter does not appear to have any relation with the nu- 

 cleus, except that it has always its point of concentration 

 directed to the point where the nucleus is situated, and be- 

 tween this latter and the mother-cellule. By ulterior deve- 

 lopment not only the quantity of the greenish granular mass 

 augments, but its separation into two adjacent masses, which 

 has already commenced sometime, becomes manifest, the 

 two masses being at first reunited (fig. 9, 12), but afterward 

 they become completely separated (fig. 13) ; at the same time 

 we see that the colourless, mucilaginous, granular mass in 

 which the green substance is found deposed becomes aug- 

 mented. In the commencement this colourless substance, as 

 also the green granular substance, was spread against the 

 wall of the mother-cellule ; but now those two substances 



