Ernest Warren 
105 
The group in which the experimental result diverged the most widely from the 
theoretical result was DR x RR (heterozygous plants crossed with recessives) and 
it would be interesting to know whether such is generally the case in Mendelian 
inheritance. 
Gametic Nature 
of 
Number 
of 
Number 
of 
Number of Croiuiied 
Offspring 
Number of Non-Crowned 
Offspring 
Pairings 
Families 
Offspring 
Experimental 
Theoretical 
Experimental 
Theoretical 
DDxDD 
RR X RR 
DR X DR 
DRxDD 
DRxRR 
DD X RR 
16 
43 
38 
5 
12 
14 
266 
741 
777 
93 
156 
1 55 
0 
734 
187 
0 
98 
. 0 
0 
741 
194 
0 
78 
0 
266 
7 
590 
93 
58 
155 
266 
0 
583 
93 
78 
155 
Totals 
128 
2188 
1019 
1013 
1169 
1175 
The Inheritance of the Degree or lutensity of Pelorism. 
If a peloric plant be crossed with a non-peloric homozygous dominant, the 
offspring are heterozygous and non-peloric, and if these are self-fertilised or crossed 
together the peloric character re-appears in an apparently unchanged and un- 
diluted condition. If, on the other hand, a strongly peloric plant is crossed with 
a weakly peloric one the offspring are moi'e or less intermediate, and if the 
offspring are selfed or fertilised together the intermediate nature of the peloric 
character tends to be retained. 
In the accompanying table A, B, G, D, E are plants of various gametic con- 
stitution. On selfing {A) the offsjjring were all fully peloric. On selfing some 
5 offspring, A, 2 — 9, the plants produced were all essentially fully crowned. 
On crossing two recessive plants {A and E) of different peloric intensities (see 
bottom of table) the offspring tended to be intermediate. 
On crossing {A) with an ordinary plant {B) the offspring were non-peloric and 
heterozygous. On selfing two of these plants, {A x B) pis. 2 and 7, the offspring 
were either fully peloric, or non-peloric (heterozygous and homozygous). On 
selfing two recessives, {A x B) 2, pis. 8 and 9, obtained from {A x B) pi. 2, the 
offspring were all nearly completely peloric. Thus, there was no clearly marked 
dilution or apparent contamination by crossing a peloric plant with a non-peloric 
one. When, however, the same recessive plant {A) was crossed with a hetero- 
zygous plant ((7) having in its gametes a weak peloric tendency of about 35° 
there was much variation in the offspring, and on selfing some of these plants, 
{A X G) 1, 2, 7, 11, and raising a new generation it was obvious that considerable 
dilution of the peloric tendency had occurred. On crossing the same plant (^1) 
with a heterozygous plant (D) having a stronger peloric tendency (75°) in its 
gametes it was clear that in the next generation raised {A x D) 6, 5, 11 less 
dilution had taken place than in the former case. 
