Recent Papers on CEnothera Mutations. 300 



22. Giglio-Tos, E. " Les derniferes experiences du Prof. De Vries et 



r^clatante confirmation de mes lois rationelles de 

 I'hybridisme." Biol. Centralbl., Bd. 31, 1911, pp. 

 417-425. 



23. Goldschmidt, R. " Die Merogonie der (Enotliera-Bastarde und die doppel- 



treziproUen Bastarde von De Vries." Arch. f. 

 Zellforsch., Bd. 9, 1912, pp. 331-344, 6 figs. 



24. Heribert-Nilsson. N. " Die variabilitat der CEnothera Lamarckiana und das 



Problem der Mutation." Zeitschr. f. Abst. — u. 

 Vererbungslehre, Bd. 8, 1912, pp. 89-231, 3 plates, 36 

 figs. 



25. Honing, J. A. " Die Doppelnatur der CEnothera Lamarckiana." Zeitschr. 



f. Abst.-u. Vererbungslehre, Bd. 4, 1911, pp. 227- 

 278, 10 figs. 



26. Leveille, H. " Monographic du genre Onothera. III." Le Mans, 1913. 



27. Lutz, Anne M. " Triploid mutants in CEnothera." Biol. Centralbl., Bd. 



32, 1912, pp. 385-435, 7 figs. 



28. Stomps, T. J. " Die Entstehung von CEwottew g't^g'as De Vries." Ber. d. 



deutsch. bot. Ges., Bd. 30, 1912, pp. 406-416. 



29. ,, "Mutation bei CEnothera biennis L." Biol. Centralbl., 



Bd. 32, 1912, pp. 521-535, pi. 1, fig. 1. 



30. Strasburger, E. "Chromosomenzahl." Flora, Bd. 100, 1910, pp. 398- 



446, pi. 6. 



POSTSCRIPT. 



Since this very condensed review was written, an important 

 work by De Vries' has appeared, dealing chiefly with CEnothera 

 experiments and considering the whole mass of results in relation 

 to the mutation theory. An impression of its comprehensive 

 treatment of the subject of heredity and mutation in CEnothera may 

 be obtained from the headings into which the work is divided. These 

 are (i.) the origin of species through mutation, (ii.) reciprocal and 

 double reciprocal hybrids, (iii.) twin hybrids, (iv.) the pangenetic 

 investigation of new species, (v.) the causes of mutations. iVIany 

 of the results here presented in extenso have been published in 

 summary form during the last few years. 



The great value of the present book lies not only in the huge 

 accumulation of experimental data which it contains — and this is 

 far more extensive than has ever been brought together for any 

 other similar group of forms — but in the remarkable manner in 

 which the hereditary behaviour and the mutation behaviour are 

 shown to be correlated. The analysis of various wild species, such 

 as O. biennis L., O. muricata L., O. Hookeri Torr. and Gray, 0. 

 cruciata Nutt., O. strigosa Rydb., and several undescribed species, 

 is carried out by means of extensive series of crosses. These are 

 the reciprocal and double reciprocal hybrids. For the most part 

 the reciprocal hybrids are unlike, being usually patroclinous. In 

 this way it is shown that the pollen and egg-cells of various species 

 are carrying different qualities, those of the pollen being usually 

 nearly the same as the external characters of the plant, while 

 those carried by the eggs are quite different and can only be brought 

 to light by crossing with certain species whose pollen and egg-cells 

 carry the same characters. 



• De Vries, Hugo. " Gruppenweise Artbildung, unter specieller Beruck- 

 sichtigung der Gattung (E»o;A«c«." Gebruder Borntraeger, Berhn, 1913; pp. 

 965, with 22 coloured plates and 121 text-figures, 



