i6o 



STRUCTURAL HYBRIDS 



Rhceo discolor* {n = 6) (12) 



Humulus japoniciis* S • 



H. lupulKs* (^ . . . • 



Briza media* .... 



Zea Mays (in experiment) (4) and (6) 

 Eucharidiiim concinnnm* 

 Clarkia elegans* {n =9), 2 plants 



(4) + 7 (2) 

 Polemonium ccsruleimi 

 Hypericum punctatiim* {n —- 8) (16) 

 Matthiola incana [n —7) 

 Rosa forms {n — 7) 

 Trimerotropis citrina {n = 12) 

 ?Diaptomus castor 

 Secale cereale (w = 7 + /) 8 cells : 



(4) + 5 (2) + #. 

 Allium ammophilum {n = 8), (4) 



+ 6(2) 



Rtimex acetosa {zn = 14 + XYjYg, 



(4) + 5 (2) + XY,Y,t . 

 Crocus chrysanthits {n =4), (4) 



+2(2) 



Festuca pratensis (4) -f 5 (2) . 



Artificial Hybrids. 



Vicia sativa (6) X V. angiistifolia 



(6). (4) + 2 (2) 

 Datura Stramonium (12) x (12). 



(10) + (2) .... 



Pisum humile X P. arvense (4) + 5 (2) 

 Triticum cBgilopoides (7) x ^. 



squarrosa (7). (3) + 3" + 51 

 Triticum cBgilopoides baidaricum (7) 



X T. CB. stramineonigrum (7) 



(4) + 5 (2) 

 Allium Cepa x A. fistulosum (4) 



+ 6(2) 



Progeny of X-rayed Stock {cf. Ch. X). 

 Drosophila melanogaster (w = 4) 



Circotettix verruculatus {n = 12) 

 Apotettix etirycephalus (X-autosome) 

 Zea Mays (w = 10) 



Triticum monococcum (w = 7) 

 Oenothera blandina (w = 7) 



Belling, 1927 ; D., 1929, a and c ; 



Nebel, 1932 ; Sax, 1931 ; Koller, 



1932 c. 

 Kihara, 1929 b {v. sex 



chromosomes) . 

 Sinoto, 1929 {v. sex chromosomes). 

 Kattermann, 1930, 1931. 

 Burnham, 1930 ; McClintock, 193 1. 

 Schwemmle, 1926. 



Hakansson, 193 1 b. 

 J. Clausen, 1931 a. 

 Hoar, 1931. 



Philp and Huskins, 1931. 

 Erlanson, 1931 b. 

 Carothers, 1931. 

 Heberer, 1924. 



D, 1933 



Levan, 1935. 



Yamamoto, 1935. 



D., unpub. 

 Rancken, 1934. 



Sveshnikova, 1929 b. 



Bergner and Blakeslee, i935 



cf. Blakeslee, 1928. 

 Hakansson, 1936. 



Kihara and Lilienfeld, 1935. 



L. Smith, 1936. 

 Levan, 1936. 



Muller, 1930 ; Dobzhansky, 1931 ; 



Painter, 1934. 

 Helwig, 1933. 

 Robertson, 1936. 

 McClintock, 1933 ; E. G. Anderson, 



1935 ;D-, 1934- 

 Katayama, 1935 a. 

 Catcheside, 1935. 



* Chiasmata all terminal apart from those arrested by change of homology, 

 cf. Ch. Xn. Numbers in brackets are the numbers of chromosomes in a ring. 



t Said to be reciprocal, but this cannot be proved. 



