Ernest Warren 
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12 plants raised none of the plants exhibited splitting. Two of these offspring 
(R. J. nos. 9, 16) were selfed and no splitting occurred in the two families. 
Another generation was raised from R. J. 16, plant 14 and some re-appearance of 
splitting was detected. The table includes all the split plants which have occurred 
among some 3000 plants which have been under observation. 
The results obtained indicate that heredity has some influence, but the data 
are insufficient for determining the nature of the transmission which does not 
bear a Mendelian aspect. 
Greased Upper Lip. — In a certain plant in the majority of the flowers the 
upper surface and lip exhibited a conspicuous pucker or crease. This plant was 
crossed with an unrelated normal plant with no crease. Most of the seedlings 
were killed by the violent elements, but four plants were raised, and in one, 
a number of flowers exhibited a crease, which, however, was much less developed 
than in the paternal parent. The data are scanty, but the hereditary trans- 
mission does not seem to be Mendelian. 
Spontaneous Appearance of White plants. — Among the numerous homozygous 
dominant coloured families that have been raised a white plant appeared spon- 
taneously on two occasions in two unrelated families. These plants, of course, 
bred true, and as there was no evidence of contamination of the seed the plants 
must be regarded as new sports. 
5. Inheritance of Seed-Length. 
The mean length of the seed varied considerably in different plants. No 
discontinuous variation could be detected, and inheritance was of the blended 
type. Ten seeds were taken at random from one or more capsules of a number 
of plants of certain series and the means determined. The seeds of a capsule 
exhibited a moderate amount of variation, but they were monomorphic in varietal 
crossings, and not dimorphic as was noticed in an interspecific crossing. The 
distribution was more or less normal. Unfortunately there was very considerable 
variation in the mean size of the seeds in different capsules of the same plant, 
and consequently no very accurate determination of the strength of inheritance 
was possible with this character without an excessive number of measurements. 
As it was, the investigation entailed the measurement of about 1000 seeds. 
A plant, Ci (mean seed-length 639 units), was crossed with (mean seed- 
length C28 units) and a family was raised ; x B^^ II. In family II twelve 
plants were selfed, namely II 1, II 2 ... II 12, the seeds were measured and twelve 
families were obtained. In family II 1 three plants were selfed and the seed- 
length determined, namely (II 1) 1, (II 1) 2 and (II 1) 4. The means of the seed- 
lengths of these three plants were compared with the seed-length of the parent 
II 1. Similarly, for example, in family II 1, 2 two plants were selfed, namely 
(II 1, 2) 5 and (II 1, 2) 20, and the means of the seed-lengths of these two plants 
were compared with the seed-length of the parent II 1, 2. The data are given in 
the accompanying table. 
