308 



NATURAL SCIENCE 



[November 



outer layer of this colony in the most primitive Scale-mosses 

 is converted into a capsular wall, while the inner cells are re- 

 productive cells, each of which forms a brood of four spores. In 

 the Leaf-mosses the colonial body formed by the segmentation of the 

 coupled-cell is much more modified, with increase of specialisation 



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and corresponding sterilisation ; for its lower part is converted into 

 a bristle-like stalk, and the wall and centre of the urn-shaped 

 capsule are both composed of green tissue adapted for the formation 

 of organic food materials. 



Before we group these facts into a table we must notice the 



