218 SUMMARY OF CONCLUSIONS. 



which, in impregnation, a basis is formed for a 

 new cycle of changes of the same kind. 



4. On the other hand, a [farther expansion must he 

 given to the formula, to adapt it to cases of repeated 

 pullulation. For this purpose a middle term must be in- 

 serted under each head ; for, as has been shown, a process 

 of pullulation may be interpolated in any of its three stages. 

 Thus modified, the formula will stand as follows : 



I. PROTOMORPHIC STAGE. 



Development of the fecundated germ into a rudimen- 

 tary form. 



Pullulation, or production of a continued series of 

 gemmae, which are either detached, or remain in 

 connection with the stock as a compound organ- 

 ism (Protonema . ) 



Gemmation, or formation, in the concluding links of 

 the series, of new points of growth. 



II. ORTHOMORPHIC STAGE. 



Development of such gemmae into organisms of the 



typical form of the species. 

 Pullulation to a variable extent in this form (a Poly- 



pidom or Vegetation.) 

 Gemmation, in the concluding pullulations, of fresh 



points of growth, for the evolution of sexual 

 , organs. 



III. GAMOMORPHIC STAGE. 



Development of the latter growths into sexual structures 

 of greater or less complexity. 



