EXTRACT XII. 



LIKE PRODUCES LIKE IS A DOCTRINE UNIVERSALLY 

 TRUE THROUGHOUT THE WORLD OF ORGANIC 

 NATURE. 



THE truth of this doctrine is now acknowledged by 

 physicist pure and simple, chemist, physiologist, and path- 

 ologist alike, i.e. throughout the domain of matter and 

 energy as known to these scientists matter in its inorganic 

 and organic varieties, and " organic energy" by whatever 

 name denominated, being subject to its all-pervading 

 influence. 



The inorganic matter composing the crust of the earth, 

 on passing through its long series of changes, as recorded 

 in the archives of its strata, has comported itself with the 

 utmost constancy to the requirements of its evolutionary 

 operation, and has, through the long asons of time that 

 have passed since its departure from " chaos," made 

 gradual progress along the stages of like producing like, 

 with one step farther, better, and higher, until now a 

 retrospect of unbroken continuity of likeness and advance- 

 ment of production is traceable, of the greatest precision 

 and consistency, throughout its whole extent. No new 

 elements have been evolved, no unfamiliar methods of 

 procedure have been adopted, and no departure from the 

 primitive manner of evolution has been introduced to 

 disturb the sequence of materio-dynamic events. 



Of organic matter the same may be affirmed, and with 

 equal truth, although here, from the first establishment of 

 the lowest living form or organic unit until the final 

 evolution of the " human form divine," a more multi- 



