FURTHER EXPERIMENTS ON THE INHERITANCE 

 OF "DOUBLENESS" AND OTHER CHARACTERS 

 IN STOCKS. 



By EDITH R. SAUNDERS, 

 Lecturer and late Fellow of Newnham College, Ccembridge. 



TABLE OF CONTENTS. 



PAOK 



Statement of conclusions arriTed at in the earlier experiments .... 303 

 Later experiments on the inheritance of " doableness " and plastid colour . . 306 

 I. Baces which were obtained only in the double-throwing form • . . . 306 

 II. Baces which occur both in the form of double-throwing and non-double- 

 throwing strains 311 



III. Proportion of doubles obtained from the eversporting strains when self- 

 fertilised or inter-crossed 317 



lY. Constitution of the zygote and segregation in the eversporting forms . 321 



V. Segregation in Fi orossbreds derived from two eversporting forms and 



statement of the results obtained in F2 324 



YI. Constitution of the zygote and segregation in the pore-breeding (non- 

 double-throwing) strains 334 



VJi. Segregation in Fj crossbreds derived from unions between eversporting 

 and non-double-throwing forms and statement of the results obtained 



inFa 336 



Yin. Summary 356 



Appendix. Note 1. On the relative viability of seeds giving rise to singles and 



doubles 361 



Note 2. On the inheritance of the branched and the nnbranched 



habit 368 



Note 3. On certain sap-colours not dealt with in the earlier accounts, 



and on the constitution of the sulphur-white race . 369 



Statement of conclusions arriyed at in the earlier 

 experiments. 



The experiments recorded in the present paper form a continuation 

 of those of which I have already given some account elsewhere*, and it 

 may be well, before considering these later records, to recall the main 

 conclusions given in the earlier accounts. 



* Beports I — lY to the Evolution Committee of the Boyal Society. In regard to 

 "donbling" see II, 1905, p. 29; m, 1906, p. 44; lY, 1908, pp. 4, 36. 



