GENERAL REMARKS. 



363 



2. Section of apex of theca, at a comparatively late period 

 shews the prior developement of the outer peristo- 

 me, a theca outer wall, b. opercle annulus omitted, c. in- 

 ner membrane, d. columella, e. its apex, f. outer peris- 

 tome, 2a. sporula. 



2b. Portion of apex of columella and of outer peristome 

 detached. 



3. Mature theca except so far as sporula and inner peristo- 

 me are concerned, same letters same references, g. ap- 

 pearance of inner peristome, h. annulus, i. sporula. 



4. Young theca : shewing the appearance of a cavity, it 

 has undergone no change of situation. 



5. More advanced, the theca has commenced pushing off 

 the calyptra, same appearance of a cavity, but to a 

 greater extent. 



6. More advanced, viewed as an opaque object, shewing 

 the extent of the stomatose part, the upper cavity has a 

 peculiar green lisse appearance while the opercle looks 

 horny. 



The calyptras inflated part covers at this time the theca. 

 b. Section of same, a theca outer wall. 



b. Cavity, c. mass to be absorted, d. columella, e. opercle. 



c. A stoma, nearly perfect. 



7. More advanced, still enclosed in the inflated base of the 

 calyptra ; same letters have same references. 



The curious inversion of effect in Ferns and Mosses is wor- 

 thy of remark; the male organs of Ferns undergo in some de- 

 gree analogous changes to those of the style and stigma of 

 Mosses. 



There are some parts worthy to be remarked on in Lin d leys 

 Introd. Mosses, both because that book is the production of 

 one of the most justly celebrated botanists we have, and be- 

 cause it is in the hands of every beginner. 



Of his hypothesis of the analogical nature of the organs of 

 fructification it may be said, that ingenius as it is, it is only 

 correct so far as the calyptra, that is the piatillum is concerned. 



