5384 CANNON: STUDIES IN PLANT Hyprips: 
coupled together in the hybrid organism, not being capable of sep- 
arating from each other — correlations are not unknown among 
hybrids. The idea suggests itself that the case might be very dif- 
ferent if the number of the chromosomes in relation to that of the 
characters were greater than in the pea ; the chance association and 
distribution of chromosomes representing portions of characters 
might not bring about so evident a distribution of characters in 
the hybrid generations, the Mendelian reversions. May it not be 
possible then that fortune favored Mendel when he selected for his 
experimentation plants which had so small a number of chro- 
mosomes ? * 
New York BOTANICAL GARDEN. 
List OF THE MoRE IMPORTANT RECENT WoRKS ON PLANT HYBRIDS 
Abbado, M. L’ibridismo nei vegetali. Nuovo Giorn. Bot. Ital. II. 5: 76, 265. 1898. 
Ames, 0. (1) Lobelia inflata cardinalis. Rhodora, 3: 296. 1901; (2) Repro- 
duction in relation to problems in hybridization. Am. Gard. 22: 130. IgOl. 
Andrews, A. L. A natural hybrid between Habenaria bacera and H. psychodes. 
Rhodora, 3: 245. Ig01. 
Arcangeli, G. (1) Sopra alcuni Mercissus. Bull. Soc. Bot. Ital. 2: 480. 18933 
(2) Sopra varie mostruosita dell’ Ajax odorus Car., e della sua prolabile origene. 
Bull. Soc. Bot. Ital. 2: 290. 1893. 
Bailey, L.H. (1) Crosses and crossing of plants. Gard. and For, 5: 2. 1892. 
(Reprinted in) Gard. Chron. III. 11: 235, 266, 298. 1892; (2) Cross-breeding 
and hybridizing. (Rural Library, v. 1, no. 6, Ap) 1892; (3) Fruit items. 
Am. Gard. 14: 500. 1893; (4) Hybridisation in the United States. Jour. Roy- 
Hort. Soc. 24: 209. 1900; (5) Plant-breeding. New York, 1895; (6) The 
hybridity corollary. Bot. Gaz. 22: 460. 1896, 
Barron, L. (1) The hybrid origin of roses. Am. Gard. 22: 5. 1901; (2) The 
varying quality of adaptability in hybrid types. Am. Gard. 24: 200. 1903- 
Bateson, W. (1) Hybridisation and cross-breeding as a method of scientific investi- 
gation. Jour. Roy. Hort..Soc. 24: 59. 1900; (2) Mendel’s principles of he- 
redity. A defense. With a translation of Mendel’s original papers on hy bridisa- 
tion. Cambridge, 1902; (3) Note on the resolution of compound characters by 
cross-breeding. Proc, Cambridge Phil. Soc. 12: 50. 1903. 
Bateson, W., & Saunders, E.R. Experimental studies in the physiology of heredity. 
Rep. Evolution Committee Roy. Soc. Report I. 1goz. 
* The data at hand showing the number of chromosomes in the somatic cells of 
Mendelian hybrids are unfortunately not complete. According to Wilson (The Cell, 
206), in wheat there are 16 chromosomes, and in cattle and rats the number is probably 
the same ; the mouse has 24 chromosomes ; according to the present study the pea hes 
14. On the other hand, there are 56 chromosomes in the somatic nuclei of hybrid 
cotton, but the nature of the variations in the cotton, whether or not Mendelian, has 
not, I believe, been determined. 
