ao LUTHER BURBAXK 



mtich as they are fixed forms of plants that vary 

 very widely from the parent forms. 



In a Kifiu'lf row I have seedling walnut trees 

 two inches high that are of the sani? age with 

 otiiers six feet in height, both grown from seeds 

 of the lame tree, and under exactly the same con« 

 ditlons and this dilTerence continues through the 

 life of the trees. The ShasU daisy and the w) 

 blackherr>* ar nts in the same sense. And 

 as the reader "... .i.«»oover in due course, the 1- * 

 of such anomalies might be extended to \v 

 some lengths. 



In a word, it is perhaps not too much to futy 

 that my entire uork has oontlsted in dc • * ith 



mutations in plant life. My f*'**-^ ^rork ....■,mI be 

 held, and I helie\*e justly li lie an exposi- 



tion of the truth of the theor\- of mutation in to 

 far as it applies to the explanation of the origin 

 of species. 



Over and over again, many thousand times in 

 the aggregate, I hare selected mutants among my 

 plants and have developed from them new fixed 

 rtcas. But in the vast majority of cases I knew 

 predaely how and why these mutants originated. 



They were hybrids; and they were nmfsnts 

 hiemue they were hybrids. 



And so from the outset I have believed that 

 Professor de Vrics*s celebrated evening prim- 



