The inheritance of certain Quantitative Characters in Tobacco. 123 
the parents and F, average about the same number of leaves, the 
F, generation having about the same variability as the parents. 
The F, generation varied greatly, giving a coefficient of varia- 
bility of 15.84 +.54. Plants were produced in this generation with 
a much higher and a lower number of leaves than in F,, the range 
of variation being from 14 to 33. 
Five F, generations were grown from selected F, plants bearing 
20, 20, 22, 28 and 30 leaves respectively. One of the Fs generations 
gave a range of variation from 15 to 22 leaves, a mean value of 
18.4 + .09 and a coefficient of variability of 8.56 + .34, thus showing 
only a little greater variation than the parent types. Two gave 
variabilities as great as in Fs, while those grown from 28 and 30 
leaved Fy parent plants respectively gave intermediate variabilities 
between F, and F, and mean values of 26.6-++.16 and 28.8 + . 28 
leaves per plant. 
Thus, from crossing two strains having mean values of about 
20 leaves per plant a new type has been produced with a larger 
number of leaves. 
Table 2. 
Number of Leaves of Havana, 402, Cuban, 405, and Fy, Fs, 
and F, generations of a Cross between 402 and 405. 
iz |Leaves| Range 
No. ES ARE tok Total | A. Give 
Grown parents | Variation | | 
FORT MOAI Ce eiserne IgIO — 16—25 | 150 | 19.9 + .08 7.53 4 . 28 
EIN a ae I9II | 21 18—23 | 124 | 20.6 + . 07 23 
AOE—I—T 4 aa vivscloss eve 1912 | 23 17—25 150. | 20.02.07 .24 
HO2ZHAVanae.. ee Re) || — 17—24 | 150 19.8 + .07 27 
710 CES 6 ASC ao Aan tb IgII | 20 16—25 | 143 20.3 .10 35 
AO 2— Tl essen euere 1912 20 17—22 | 150 19.44.05 4:59.18 
(40252405) By. 2s 2 2 aes 1910 _ 16 —25 | 150) | 19.8 =. ..07 | 6.10-E.24 
(402 >< 405)—1 Fa...... | 1911 = 14—33 | 192 20.9--.16 | 15.84.54 
(402 >< 405)—1—2 F,...| 1912 20 13—29 | 112 | 19.7-.18 | 14.67 4.67 
(402 >< 405)—ı—3 F,...| 1912 20 15—22 | 142 18.4 -.09 | 8.56 -- . 34 
(402 ><.405)—1—4 F,...] 1912 28 20—35 | 148 | 26.6--.16 | 11.20-L. 44 
(402 >< 405)—1—5 F,...| 1912 30 22—34 45 28.8 +..28 | 10.00 4.20 
(402 >< 405)—1I—6 Fy... ] 1912 22 13—29 | 201 | 20.1-+.15 | 16.17.56 
These two types, Cuban and Havana, differ in leaf size, the 
Havana giving a somewhat larger leaf area. Both types have about 
the same leaf width but the Havana leaf is longer. The F, gene- 
ration was of intermediate leaf size and in F, there was an increase 
