64 Immunity hi Cereals 



The similarity in tlio cjiisc of wheats is even more striking. So, Tr. monococcum, 

 according to Dr Zade's experiments, occupies a separate place. Three species Tr. 

 durum, Tr. polonicum and Tr. turgidnm, which have the same fungal reactions, had 

 the same "serum" reaction. The Tr. vidgarc, Tr. com/uic/am and Tr. Spella, both 

 in relation to fungi and in their " .serum " reaction are very similar. 



The similarity of " serum " reaction of Tr. dicoccum with that of Tr. durum, 

 polonicum and turgidnm. again does not contradict our results ; for probably 

 Dr Zade used for his experiments a variety of Tr. dicoccum which is immune to 

 brown rust. It is to be regretted that Dr Zade does not give the nanie.s of the 

 varieties with which he worked. This makes a complete comparison of results 

 ditticult. 



On account of the great polymoi'phism of tlie species Tr. dicoccttm (and Tr. 

 dicoceoides) which is very important for the construction of the genealogy of wheats 

 and which was not taken into consideration by Dr Zade, we cannot agree completely 

 with the concluding genealogical table of wheats, given on p. 144. We believe 

 that the difference in varieties which occurs in species of cereals cannot be neglected 

 in genetic work. 



The striking parallelism of fungal and " serum " reactions once more confirms 

 the possibility of using both these methods for genetic and systematic purposes. 



REFERENCES TO LITERATURE. 



1. BiFFEN, R. H. "Studies in the inheritance of disease-resistance." Journ. of 



Agric. Science, Vol. ll, Part 2, 1907. 



2. . "Studies in the inheritance of disease-resi.stancc." II. Journ. of 



Agric. Scie7ice, Vol. iv. Part 4, 1912. 



3. Beijerinck. " Ueber den VVeizenbastard Tr. monococcv.m x Tr. dicoccum." 



1884. A'ederl. Kruidkund. Archif, 2 Ser. p. 200. 



4. Eriksson, J. "Ein parasitischer Pilz als Index der inncrcn Natur eines 



Pfianzenbastards." Botan. Notizcr, 251—253, 1895. 



5. Freeman and Johnson. "The rusts of grains in the United States." Bull. 



No. 216. Bureiiu of Plant Industry, U.S. Dep. of Agriculture, 1911. 



6. KiRCHNER. " Neue Beobachtungen iiber die Empfanglichkeit verschiedener 



Weizensorten fiir die Steinbrandkrankheit." Filhlings btndtnrtsch. Zcitung. 

 1908. 



7. Klebahn. " Die wirtswech.seluden Rostpilzo." 1904. 



8. Koernicke, F. " Arten uud Varietiiten des Getreides." Vol. I, 188.5. 



9. . " Die Entstehung und das Verhalten neuer Getreidevarietiiten." 1908. 



Archiv fiir Biontologic, Bd. II. 



10. ScHULZ, A. " Abstammung und Heimat des Weizens." Jahrcsberic/U d. West- 



fiilischen Provindal-Verein, 1911, pp. 147 — 152. 



11. Swingle. "Report on the loo.se smuts of cereals." Experiment Station, 



Manhattan, Kansas, 1889. (Report of the Botanical Department.) 



12. Thellung, a. "Ueber die Abstammung, den systematischen Wert und die 



Kulturgeschichte der Saathafer-Arten." 1911. Vierteljahrsschrift d. Xaturf. 

 Ges. Ziirich, Jahrg. 56. 



