42 PROCEEDINGS OP THE 



Impure tails, resulting from crossing of the two types, produce 

 tails and dwarfs. Thus : — 



ri[R] X R 



E X D[E] E X R 



I I 



I I E X E 



E X D[E] E I 



_ I _ E 



I I 



D[Ej E 



Note especially that the Eecessives (E) never reproduce^the 

 Dominant character. 



This is exactl}' wliat occurs amongst the Brachydactylous 

 people. So far as now traceable each abnormal individual has 

 had one abnormal parent, and one normal, for there is no record 

 of two short-lingered people marrying one another. 



The short-fingered people may be represented by D[E] — they 

 are dominant — each has married a normal, who is recessive (E), 

 with the result shown in the diagram. A short-fingered parent 

 has children of both types, in about equal numbers. Where both 

 parents are normal, all tlie children are normal also. 



These families provide a number of definite fads in support of 

 Mendel's theory, and that is my reason for bringing the subject 

 to the notice of this Society. 



[A list of the 69 slides shown, with detailed explanations of 

 each individual case, was appended.] 



Miss Saukdees has since supplied the following account of her 

 plants : — 



The original heptandrous individual from which my 1915 plants 

 (occupying about half an acre) are descended, appeared in a 

 Cambridge garden in 1906. In 1911 a peloric plant also appeared 

 in Cambridge, and I crossed my heptandrous stock with this 

 individual iu order to see whether any interference or inhibition 

 would result when the two characters were combined. I pub- 

 lished an account of the inheritance of heptandry in the Jan. -Feb. 

 number of the ' New Phytologist ' for 1911 (vol. x. pp. 47-63). 

 That peloria breeds true from seed was well known in pre-Men- 

 delian days (see Gr, Vrolik, in Flora, xxix. 1846, pp. 97-103), and 

 Keeble, Pellew, and Jones found that it behaves as a recessive to 

 the normal (see ' New Phytologist,' 1910, vol. ix. pp. 58-77), but 

 the inter-relations of heptandry and peloria were unknown. 



In June 1911 I had a request from Mr, Macnamara (made, I 

 believe, at the suggestion of Pi'ofessor Deudy) that I should go 



