WHITE: INHERITANCE OF HEIGHT IN PEAS 317 
all of this type, but those of Keeble and Pellew (то) and others 
belong to at least two types. 
Crosses between talls and half-dwarfs gave all tall in Е and 
approximately 3 talls : 1 half-dwarf іп Ез in some cases (Tscher- 
mak, 'o2), while in other cases talls, half-dwarfs, and true dwarfs 
have appeared in Е, (Bateson, 05, 700, p. 19). Half-dwarfs with 
long internodes crossed with half-dwarfs with short internodes 
gave talls with long internodes in F; and approximately 9 talls : 3 
half-dwarfs (short internodes) : 3 half-dwarfs (long internodes) : 1 
dwarf in F». The results actually obtained by Keeble and Pellew 
(то) were 114 : 33 : 32 : 13—expected 108 : 36 : 36 : 12 
Notes taken by the writer for several years on the height, 
internode length, and internode number (per plant) of over 200 
varieties of peas, grown under similar soil and climatic conditions, 
indicate a still greater complexity as regards the inheritance and 
classification of height in varieties of this genus. 
For example, tall varieties (over 4.5 feet) may be divided into at 
least three distinct groups. One type of tall pea has 40 to 60 long 
internodes (Scotch Beauty, Spáte Gold). Another type has 20 to 
40 long internodes (Mammut, Goldkónig, White-Eyed Marrowfat). 
The internodes of each of these types average twice or more the 
length of the short internodes of the dwarfs. The third type of tall 
pea varieties is illustrated by Haage and Schmidt’s “Graue Reisen 
Schnabel” which has 21 to 30 very long internodes. Variation in 
height and internode number among plants of the same true breed- 
ing variety is due largely to differences in environment. The 
absence of the factor for normal stem (Fa), causing fasciation, also 
brings about a shortening of the internodes. Other types of talls 
doubtless exist, but the writer’s studies have not been detailed 
enough as yet to recognize them. 
Crosses between the three types d talls, so far as they have 
been made, give in F; and F; all talls, but talls of different types. 
Large number of internodes is usually dominant over the low- 
number types. Sufficient data, as yet, are not available to deter- 
mine the relation of these types in terms of factorial differences. 
Each type of tall undoubtedly represents a separate and distinct 
mutation. 
As in the case of the tall-growing varieties of peas, the so-called 
