cells to form a mosaic or mottled surface. 

 Although these hybrids were quite unexpected, 

 it was recalled that Tschermak 2 had secured 

 similar results in a number of cases, and 

 Emerson 8 describes them also in crosses be- 

 tween ' Ultra' and ' Navy,' this being pre- 

 sumably the very same cross that I present 

 here as l Ne plus ultra ' X ' White flageolet.' 



Very similar phenomena have been seen by 

 Tschermak, 4 Bateson, 5 and Lock* in peas, by 

 Tschermak* and Bateson 5 in stocks, by Bate- 

 son 5 in sweet peas, by Correns 7 in Mirabilis, 

 by Cuenot 8 in mice, and by Castle 9 in guinea- 

 pigs. It is not because of the newness of the 

 phenomenon, therefore, that I draw attention 

 to the subject, but for the purpose of dis- 



a Tschermak, E., * Weitere Kreuzungsstudien an 

 Erbsen, Leukojen und Bohnen,' Zeitschr. Landw. 

 Versuchsw., 7: 533-638, 1904. 



'Emerson, R. A., 'Heredity in Bean Hybrids,' 

 Ann. Kept. Agr. Exp. Sta. Nebraska, 17: 33-68, 

 1904. 



* Tschermak, loc. cit. 



6 Bateson, W., Saunders, Miss E. R., Punnett, 

 R. C., 'Experimental Studies in the Physiology 

 of Heredity,' Second Report to the Evolution Com- 

 mittee of the Royal Society, London, 1905. 



6 Lock, R. H., ' Studies in Plant Breeding in th 

 Tropics/ Ann. Roy. Bot. Gard. Perideniya, 2: 299- 

 356, 1904. 



7 Correns, C., ' Ueber Bastardirungsversuche mit 

 Mirabilis Sippen,' Ber. d. d. Bot. Ges., 20 : 594-609, 

 1903; 'Zur Kenntniss der scheinbar neuen Merk- 

 male der Bastarde. Zweite Mittheilung iiber Bas- 

 tardirungsversuche mit Mirabilis Sippen,' Ber. d. 

 d. Bot. Ges., 23: 70-85, 1905. 



1 Cunot, ' Le loi de Mendel et The're'dite- de la 

 pigmentation ehez les souris,' Arch. Zool. exper. 

 et gen., : 27, 1902; ' L'he're'dite* de la pigmenta- 

 tion chez les souris' (2me note), Arch. Zool. 

 exptr. et gen., 4 Se., 1: 33-41, 1903. 



"Castle, W. E., 'Heredity of Coat-characters in 

 Guinea-pigs and Rabbits,' Publ. Carnegie Institu- 

 tion of Washington, No. 23, 78 pp., Feb., 1905. 



