362 HANS AND OLOF TEDIN 



physiological correlation or a case of gametic coupling. Further in- 

 vestigations may, perhaps, throw light upon the nature of the 

 correlation. 



The investigation has been carried out as part of the breeding 

 work of the Swedish Seed Association. 



Svalöf, May 1923. 



LITERATURE CITED. 



1. JoHANNSEN, W. 1913. Elemente der exakten Erblichkeitslehre. II. Auflage. 



Jena, Fischer. 



2. Keeble, f. and Pellew, C. 1910. The Mode of Inheritance of Stature and 



Time of Flowering in Peas (Pisum sativum). Journ. of Genetics, I, pag. 47. 



3. Tedin, H. 1897. Nâgra synpunkter vid förädling av ärter. Sveriges Utsädes- 



för:s Tidskrift, 1897, pag. 111. 



4. — 1920. The Inheritance of Flower Colour in Pisum. Hereditas, I, pag. 67. 



5. — 1923. Eine mutmassliche Verlustmutation bei Pisum. Hereditas, IV, pag. 33. 



6. Ubisch, G. V. 1921. III. Beitrag zu einer Faktorenanalyse der Gerste. 



Zeitschr. f. induktive Abst. und Vererbungslehre, 25, pag. 198. 



7. White, O. E. 1917. Studies of Inheritance in Pisum. II: The Present State 



of Knowledge of Heredity and Variation in Peas. Proc. of the American 

 Philosophical Society, Vol. LVI, pag. 487. 



ERRATA. 



In the paper on seed coat colour (Tedin 1923) three printer's errors appeared, 

 which here are corrected: 



Pag. 35 line 13 from above stands: (3.-4.) Should be: (3—4) 



» 40 » 4 » below » : 4 » » : A 



» 41 » 12 » » » : (Tschermak's 7.1 » » : (Tschermak's Li) 



und L2) und L2. 



