E. R. Saunders 313 



Number of pollen 

 Number of f , Matings from which the Fi grains tested in the case 



plants tested plants were derived of each <^ parent 



6 Ho-d-cream J x d-light purple ,? (plant /I) 6 

 14 ,, „ X „ „ (plant £) 14 



7 mo-rf-flesh ? x „ „ (plant B) 7 

 1 *7io-d-dark purple $ x d ,, (plant C) 1 

 6 Mo-d-cream ? x rf-azure s 6 

 1 *no-d-flesli ? x d-dark purple i 1 

 1 *no-d-white ? x d-copper<? 1 



Total 36 Total 36 



AH the 36 F^ cross-hreds yielded doubles in F.,; hence all the pollen 

 tested must have been carrying the double chaixicter. 



(b) Non-sap-coloured races. 



The results recorded in the case of the glabrous white and cream 

 races are less consistent than those obtained with the sap-coloured 

 forms, but, if the conclusion which a review of all the evidence seems 

 to render most probable should prove correct, viz., that in the case of 

 the non-sap-coloured forms the seed obtained commercially was not 

 homogeneous but of mixed origin, some of it being pure-bred and some 

 cross-bred, such admixture would account for the discrepancies observed. 

 On this view the facts may be taken to indicate that, where pure-bred 

 material is used, the same results may be expected to follow whether a 

 sap-coloured or a non-sap-coloured form is employed; and that these 

 races, when pure-bred, are all in fact like the sulphur-white and the 

 red, strictly eversporting. The facts in full are given below. 



i. Glabrous white race. 



Seeds stated to yield doubles were procured from two different 

 firms. Sample sowings gave the expected mixture. Certain singles 

 occurring in this first and in later generations were tested as shown 

 in Table I. 



Both lots of seed gave a different result from that obtained with the 

 sap-coloured forms, for here the singles appeared to be mixed, some 

 giving doubles according to expectation, others not. Thus in the one 

 lot, plant A, and in the next generation plant K were presumably 

 breeding true while plant B was not ; in the other lot plants H and / 

 and 21 of /'s descendants evidently belonged to the sporting class, while 

 plants C, D, E, F, G and / were in all probability breeding true. We 

 should not be surprised at a result of this kind if, either there had been 

 some mischance or want of care in the handling of the seed before it 

 was supplied, in which case we might regard the mixtuie of singles as 



