CRYPTOGAMOUS PLANTS. 259 



the whole sac is composed, separates, swells up, and 

 forms a sac resembling that of which it formed a part, 

 without our being able to distinguish any thing that can 

 be compared to a seed. 



In the Batrachospermas little buds detach themselves, 

 which are developed and produce a new individual in a 

 manner more analogous to reproduction by bulbs than 

 any other. 



In the Diatomeae the filament is continually broken 

 across by rectilinear dehiscences, and each fragment, 

 which at first seems simple, appears double, &c, and is 

 itself subdivided by transverse ruptures. 



The Oscillatoria? do not differ perhaps from this 

 mode of division, and as they present a kind of motion, 

 apparently independent of external causes, they are 

 placed by most naturalists in the animal kingdom. 

 We here touch the limits of two organized kingdoms, 

 and find here no other mode of reproduction than that 

 of simple division. 





