SOLUTION OF THE WORLD-PROBLEMS. 379 



systems ; first simple monera are formed by spon- 

 taneous generation, and from these arise unicellular 

 protists (first plasmodomous primitive plants, and then 

 plasmophagous primitive animals). 



II. — It is very probable that from these unicellular 

 protists arise, in the further course of evolution, first 

 social cell-communities (ccenobia), and subsequently 

 tissue-forming plants and animals (metaphyta and 

 metazoa). 



III. — It is also very probable that thallophyta 

 (algae and fungi) were the first to appear in the plani- 

 kingdom, then diaphyta (mosses and ferns), finally 

 anthophyta (gymno sperm and angiosperm flowering 

 plants) . 



IV. — It is equally probable that the biogenetic 

 process took a similar course in the animal kingdom 

 — that from the blastaeads (catallacta) first gastraeads 

 were formed, and from these lower animal forms 

 (ccelenteria) higher organisms (ccelomaria) were after- 

 wards evolved. 



V. — On the other hand, it is very questionable 

 whether the different stems of these higher animals 

 (and those of the higher plants as well) run through 

 the same course of development on other planets as 

 on our earth. 



VI. — In particular, it is wholly uncertain whether 

 there are vertebrates on other planets, and whether, 

 in the course of their phyletic development, taking 

 millions of years, mammals are formed as on earth, 

 reaching their highest point in the formation of man : 

 in such an event, millions of changes would have to 

 be just the same in both cases. 



VII. — It is much more probable, on the contrary, 

 that other planets have produced other types of the 



