BIOGENESIS AND ABIOGENESIS 133 



quote it in full.* " The fifth way is taken from 

 the government of things. For we see that 

 some things which lack knowledge, namely, 

 natural bodies, operate for an end. This ap- 

 pears from the fact that they always or often 

 operate in the same way so that they may do 

 the best. Hence it is clear that they reach 

 their end, not by chance but by design. But 

 beings that lack of knowledge do not make to- 

 wards an end unless directed by some cognos- 

 citivo and intelligent being, as the arrow by 

 the archer. Therefore there is some intelligence 

 by whom all natural things are directed 

 towards their end; and this we call GOD." 



There is just one point of interest before we 

 leave this matter. The entire living world 

 depends upon the energy derived from the sun 

 for the building up of those organic colloids 

 of which living structures are made up, and 

 the energy-transformer is the green-celled plant 

 by virtue of the colloid chlorophyll which it 

 contains. Those non-green-celled plants such 

 as fungi and bacteria are dependent as para- 

 sites or saprophytes on green-celled things, and 

 so are animals, either directly as herbivores 

 or indirectly as carnivores. 



* Translation of Fr. V. M'Nab, O.P., as given in his most 

 admirable little penny pamphlet entitled Aquinas, and pub- 

 lisher by the Catholic Truth Society. 



