Preface vii 



Physics, Physiology, Pathology, and other well- 

 followed sciences that an open court is always 

 sitting, composed of men themselves workers, keenly 

 interested in every new thing, skilled and well versed 

 in the facts. Where this is the case, doctrine is soon 

 tried and the false trodden down. But in our sparse 

 and apathetic community error mostly grows un- 

 heeded, choking truth. That fate must not befall 

 Mendel now. 



It seemed imperative that Mendel's own work 

 should be immediately put into the hands of all who 

 will read it, and I therefore sought and obtained the 

 kind permission of the Royal Horticultural Society to 

 reprint and modify the translation they had already 

 caused to be made and published in their Journal. 

 To this I add a translation of Mendel's minor paper 

 of later date. As introduction to the subject, the 

 same Society has authorized me to reprint with 

 alterations a lecture on heredity delivered before 

 them in 1900. For these privileges my warm thanks 

 are due. The introduction thus supplied, composed 

 originally for an audience not strictly scientific, is far 

 too slight for the present purpose. A few pages are 

 added, but I have no time to make it what it should 

 be, and I must wait for another chance of treating 

 the whole subject on a more extended scale. It will 

 perhaps serve to give the beginner the slight 



