Journal of Agricultural Research 
Vol. XXIV, No. lo 
852 
(12) In addition to determining a stipule ratio of 2.05 in Mummy, the 
factor Y acts as a stabilizer of the germ plasm. Somatic mutation of x' 
to X in the cross between Mummy and Gradus rogue (Xx'Yy) does 
not take place to the extent in which mutation of x to X occurs in the F^ 
crosses between Gradus type and rogue (XxYy) on account of the 
presence of the Y factor. 
(13) Besides mutations of x and x' to X, other mutations of x and x' 
occur which affect stipule shape. The nature of the latter kind of muta¬ 
tions has not yet been investigated. 
LITERATURE CITED 
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(2) - 
1916. NOTE ON AN ORDERLY DISSIMILARITY IN INHERITANCE FROM DIFFERENT 
PARTS OF A PLANT. In Proc. Roy. Soc. Ser. B, v. 89, p. 174-175. 
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(7) Hoshino, Yuzo. 
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(8) Mendel, Gregor. 
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(9) Morgan, T. H., and Bridges, C. B. 
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(11) Tedin, Hans. 
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(12) Tschermak, Erich von. 
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footnotes. 
(13) Vries, Hugo de. 
1905. species and varieties; their origin by mutation, xviii, 847 p. 
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(14) White, Orland E. 
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factors of PISUM. In Jour. Agr. Research, v. ii, p. 167-190. Litera¬ 
ture cited, p. 178-180. 
(is)- 
1917. STUDIES OF inheritance IN PISUM ll. THE PRESENT STATE OF KNOWL¬ 
EDGE OF heredity and VARIATION IN PEAS. In Proc. Amer. Phil. Soc., 
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(16) Yule, G. Udny. 
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