EAST:. INTERCROSSES BETWEEN SELF-STERILE PLANTS 149 
Fol oh OtaaO DOs ONFAD WAZ IAG ae -s) is sien chepencontsia a) 6 bi a) stein 2A 377: 
BIS NoaTIOEAE Oy Aiko ey StB ORS cin b oie Bebe. a det cael s.edausienae enensy News gal ee 18, 40, 42 
Ore tere oe: ZA EAA GEA Her © Emtec tonsioct cske seal cei ercener serene 6, 33, 46 
70 Se er ie OWA AA eA OMEN as eh Sar avele acer eee eee ee 33, 40, 46 
AD Nees 2O AA ae ani ery Rah ag mec O re Oct PEI 39, 41, 45 
ABS ae: 5, 27, 33, 38, 39, 40, 42, 44, 46, 51 
AAC sins 10, 14, 23, 34, 45 
ABP tes OMG ACE Oteeees Me ata n ie a a) Ae Hs ehsicr cnc) ots ees 46, 52 
AOR to NOM22 AT AAR ES Te Ret y koe eisks cia the hehe Sie sora She ee 52 
A hoe, ct 2 OAD AA EA Se Onno 527 estas cis Sit ieseisbnerneiy oe 38 
BSi So shs. 3 AO MA WAGGA Ob ata, Went as ttiae a aeieas ov Plcleueps wteis ace ena Sees LO; 23) 245.27, 34 
AQm ys er AQAA WAS Wenner hitrts, catnccnass © oxsat ot & ake sacle OF9) 275345 47 
SOs, sais OAS Os aeRO a cae eis Shoe ee, Melted cicy «SoS wthaud:S-Soe tn ote ON 27. 27 
Cy late eee One 23503 O PAG A Oy 15 Ole rare carn hel ceversietes cmleyes 8, 29 
52 eis tacks LOCO 20 wae G Lamon mele cieices 6h duro 2:4 Breis Gee ea 354, O18, 41, 45; 46 
The numerous cross-matings made are shown in Table 1. There 
were 103 reciprocal matings. Of these 100 gave duplicate results, 39 
pairs being fertile and 61 sterile. The three which did not check are: 
2 X 3, sterile, 1 pollination 
3 X 2, fertile, 1 pollination 
x 52, fertile, 1 pollination 
x 6, sterile, I pollination 
X 21, fertile, 1 pollination 
X 37, sterile, 1 pollination 
classed as fertile, 
classed as sterile, 
classed as sterile. 
Since but one pollination was made in each of these cases we have 
made our decision as to fertility or sterility by a consideration of the 
circumstantial evidence. The behavior of these plants in other crosses 
shows conclusively that 3 should be fertile with 2, 6 sterile with 52, 
and 21 sterile with 37. They have been classed accordingly. That 
this grouping is correct is further shown by the fact that the mating 
3 X 2 (classed fertile) was made at the height of the flowering season, 
while the matings 6 X 52 and 37 X 21 (classed sterile) were re- 
spectively the last and next to the last matings made on those plants. 
In spite of the fact that plants 0-39 are from cross N. alata & N. 
forgetiana, and plants 40-52 are from cross N. forgetiana * N. alata, 
they behave as one family in intercrosses. The entire population 
can be grouped into 6 classes in which there is interclass fertility and 
intraclass sterility. The following explanation may be necessary to 
make it clear just how Table II was obtained from Table I. Table I 
shows all of the matings, but in the form given it is not easy to see at a 
glance every combination in which a particular plant was used, both 
as male and as female. It was necessary, therefore, to make a new 
table, in which the pedigree numbers in the column at the left were 
tabled as males, and the pedigree numbers in the columns headed 
“Fertile matings’ and “Sterile matings’’ were tabled as females. 
