84 On the development of the Spores of Anthoceros laevis. 



commence to advance more and more towards the interior of 

 the cellule : then the green substance, interspersed with gra- 

 nules of greater or less magnitude, conglomerates into one 

 mass, and afterwards into two, surrounded by an atmosphere 

 formed of a colourless substance. 



This atmosphere extends itself outwardly into the meshes 

 already described, and resembling cellules (figs. 8, 9, 12) 

 which successively extend themselves into all the space of 

 the mother-cellule, and which at a certain period change so 

 much the form of the vesicles which are either round (figs. 8, 

 9) or angular, in consequence of mutual pressure (figs. 12), 

 that at this period at least the transformation of a part of the 

 mucilaginous into a cellular organism cannot be doubted. 



This cellular aspect of the colourless substance only 

 however exists a short time ; because, in proportion as the 

 green granular vesicles draw themselves with the nucleus 

 into the interior of the mother-cellule, a part of the colourless 

 substance accumulates around it in an amorphous mass, 

 and the circular meshes become insensibly changed into 

 filiform elongations, which, commencing at this central mass 

 assume a radiated direction towards the wall of the mother- 

 cellule, and which gives in that manner a solid position to 

 the central formation, which until this time was suspended 

 in the juice of the cellule. (Figs. 10, 11, 13, 14, 15.) 



At this period the granules of the green substance aug- 

 ment considerably in volume, and by the use of iodine show 

 that the large granules are formed of atnidon. 



The mucilaginous atmosphere, as well as the filaments 

 which emanate from it and pass towards the mother-cellule, 

 assume by the use of iodine as before a yellowish brown tint. 

 It happens also, often in consequence of being placed a long 

 time in water, or by other causes, that the granules of this 

 green mass become contracted, and occupy a small space 

 (figs. 16), or that in general they are less numerous ; in this 

 case we see very clearly that the mucilaginous atmosphere is 



