8 i8 
Journal of Agricultural Research 
Vol. XXIV, No. 10 
Two of the exceptional plants occurred in a single culture/ of which 
two plants were thorough rogues, while two others were intergrading 
intermediates, i. e., they were typelike at the lower nodes, but at upper 
nodes the stipules were pointed but much broader than in typical rogues. 
In the F2 generation the progeny of the intergrading intermediates con¬ 
sisted of 32 and 33 rogues, respectively. 
The third exceptional plant among the F^ of rogue X type was described 
in 1919 (4). Its offspring in 1919 consisted of 19 intergrading inter¬ 
mediates and 15 type plants. The same cross and its reciprocal pro¬ 
duced 7 other Fj plants, described as rogues at maturity. From the 
character of the F2 progenies (Table I) it is probable that the Fj plants 
were in reality extreme intergrading intermediates, as the F2 is char¬ 
acteristic of the progeny of intergrading intermediates. The plants 
behaved as intergrading intermediates of the sort described by Bateson 
and Pellew (i) as producing types, intergrading intermediates, and few 
or no rogues. 
Tabl^ I.—Fj and F2 generation of atypical hybrids of Gradus rogue X Gradus type and 
reciprocal 
F2 
1919 
culture 
No. 
Pedigree. 
Rogues. 
Intergrad¬ 
ing inter¬ 
mediates. 
Types. 
9.1207 
9.1208 
9.1209 
9.1210 
9.1216 
9.1217 
9.1218 
9.1219 
(Gi3-i-^itXGi9-i-3r)—i. 
(Gi3-i-6-itXGi9-i-3r^—2. 
(Gi3-i~6-itXGi9-i-3r)—^3. 
(Gi3-i-6-itXGi9-i-3r)—4. 
(Gi9-i-3rXGi3-i-6-it)—i. 
(Gi9-i-3rXGi3-i—6-it)—2. 
(Gi9-i-3rXGi3-i-6- It )—3 ..... 
(Gi9-i-3rXGi3-i-6-it)—^4. .Type foliage 
o 
o 
o 
o 
2 
o 
o 
o 
27 
23 
9 
o 
8 
27 
o 
19 
o 
o 
2 
23 
3 
o 
4 
IS 
Fg AND Fg GENERATIONS OF CROSSES BETWEEN GRADUS AND GRADUS 
ROGUE 
From 184 Fj hybrids of Gradus X Gradus rogue and reciprocal 4,319 
F2 plants were raised in 1919 and 1920. In the seedling stage the greater 
portion were easily recognizable as rogues; others could be termed 
intermediates, but none showed the typelike appearance found among 
theFj seedlings. (Among the 4,319 plants shown inTable II, 81,or 1.8 per 
cent, were from foreign pollination, as explained elsewhere in this paper. 
The volunteer out-crosses were generally distinguished in the seedling 
stage as plants with typelike stipules.) At maturity the plants were 
either rogues or various sorts of intermediates. Thirty-nine Fj rogues 
gave in the Fg generation 575 plants, all rogues except five plants (0.8 
per cent). The products of volunteer out-crossing in 1919 are shown in 
Table III. 
^ The intergrading intermediates were plants No. 3 and No. 4 of cross (Gi(>-i-i2-rtXG23-i-i-i6r) in 
the Fi generation. 
