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mic exchange we remark on our own Earth, where, not! 

 infrequently; our fields yield forms of unknown vege- 

 tation without visible cause, from seeds scattered off 

 other worlds and borne to us Heaven only knows whence. 



Where then can these seeds come from ? In all pro- 

 bability from other planet worlds. Such germs and seeds 

 falling on newly prepared soil of the young satellite, 

 under the warming influences of sun and earth develop 

 and vivity their new abode. Vegetation in company 

 with its .helper the insect, passes through all its stages 

 of development. New teeming life beginning in moist 

 and watery centres spreads itself in animal forms over 

 the mountains and the valleys and breeding and interbreed- 

 ing presents that picture of natural selection which the 

 Darwinian theory so ably and forcibly expounds. 



Thus cosmic exchange of matter between the earth 

 and the moon signifies electric energy for the former 

 and the seeds of vegetable and animal life for the latter. 



The next exchange of cosmic matter takes place bet- 

 ween the planets and the sun, as we saw in an earlier 

 chapter. It consists in the despatch of cosmic heat and 

 the return of hydro-oxygen. 



The fourth exchange proceeds between the planets 

 of a double star. In what it consists it is difficult ta 

 say inasmuch as this matter has never yet been made 

 the subject of scientific research, but seeing that the pro- 

 duct of this intercourse is the appearance of a new sun r 

 we must conclude that in some way or other one planet 

 is heated by the other to the point of spontaneous com- 

 bustion. 



We see the, fifth exchange in the pregnant solar 

 ecstasy, and in the relations between the suns and the 

 little planets. These relations are little known to astro- 

 nomers, as the asteroids themselves are invisible. 



The sixth and seventh processes of exchange are the 

 result of solar decline and the cessation of solar action 

 on the planets. The solar system gradually dying is 

 converted at first into planetary cloud and then, in pro- 



