The Present State of Knowledge of Heredity 



in Pisum. 



BY 



R. H. LOCK, 



Fellow of Gonville and Caius College, Cambridge, i.ij,'? *. RY 



NEW YORK 



BOTANICAL 

 Introduction. GARDEN 



XN two papers published in earlier numbers of these 

 -'- Annals (13, 14), and in one which appeared in the 

 Proceedings of the Royal Society (15), some account 

 has been given of experiments carried out at Pera- 

 deniya and at Cambridge in confirmation and extension of 

 Mendel's classical work upon peas. Many experiments remain 

 andescribed. The majority of these have led to results which , 

 though new of the genus Pisum, are yet closely paralleled by 

 the published observations of other workers upon other plants. 

 It appears doubtful, therefore, whether the time which would 

 be required for describing them in detail will not be employed 

 better upon other experimerts which seem likely to lead to 

 results of greater novelty. It is projDOiled in the present paper 

 to summarize briefly those aew results which have not been 

 hitherto published, and to indicate very briefly their con- 

 nection with the work of others. At the same time it appears 

 possible that a concise summary of all the most important 

 facts so far recorded with regard to heredity in Pisum may 

 be of use to others, especially when added to a statement of 

 the gaps which still remain in our knowledge of the subject. 



The present paper constitutes such a summary, in which it is 

 hoped that the new records are adequately represented, whilst 

 facts previously known are noted with all possible brevity. 



Many of the original crosses upon which the most recent of 

 these results are based were made by Mr. Bateson. I desire 

 to record here my indebtedness to him for handing over to me, 

 in 1905, the greater part of his material relating to Pisum. 



^^ [Annals of the Royai Botanic Gardens, Peradeniya, Vol. IV., Pait III,, June, 1908.] 



^ 7(6)08 (12) 



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