6 BULLETIX 1074, V. S. DEPARTMENT OF AGRICVLTrRE. 
Harz. in 1885 (104). classified and described a large number of 
Tvheats in a manner similar to that of Koernicke and "Werner. The 
common and club wheats were considered as a single species. 
Hackel. in 1887 {101). classified the genus Tritlcinn according to 
a key very similar to the one adopted by Koernicke and Werner. 
Hackel recognized three species, sativum Lam.. mo-nococcmM L., and 
poTonicami L. : and three races of sativum, namely, spelt a^ diooccum, 
and tenax. In the latter he included vulgare, com pactum^ turgidum^ 
and durum as subraces. 
Vilmorin. in 1889 (199), grouped the wheats into 50 sections, 
according to their leading characters. Each section was briefly de- 
scribed and the synon^Tns were giyen. The common and club wheats 
were considered as one species. 
Eriksson, in 1895 {S8) , subdiyided the botanical groups of 
Koernicke and Werner into smaller groups which he called subyarie- 
ties. based chiefly on the density of the spike, the thickness of the 
kernel, and the length of the rachis. He also giyes an excellent re- 
yiew of the literature on wheat classification. 
Heuze. in 1896 (11-2). published a second edition of his " Les 
Plantes Cereales." in which were included rather complete histories 
and descriptions of the yarieties of wheat. 
Cobb, in 1896 (69). keyed 51 yarieties of wheat which he was 
growing in Xew South Wales. Australia, using the leading plant, 
spike, and kernel characters. In 1905 (7:2) he proposed to classify 
wheat yarieties by a microscopic examination of the aleurone layer. 
This method, howeyer. is imjDracticable for classification j)urposes in 
the field, or eyen with certainty in the laboratory, when closely re- 
lated yarieties are considered. 
Howard and Howard, in 1909 (121), classified the wheats of India 
largely according to the methods of Koernicke and Werner and of 
Eriksson. They (120) also consider in detail the characters used in 
classification. 
Richardson, in 1913 (loS) . described many of the wheats of Aus- 
tralia and gaye the history of each yariety. He did not arrange them 
in a classified order. 
The Union of South Africa in 1919 (181) published descriptions 
and s^Tionyms of the wheat yarieties of South Africa which also 
designated the areas where the yarieties should be grown in that 
country. 
Ducellier. in 1920 (82). published a classification and descriptions 
of the wheats of tlie Hoggar and oasis regions of Algeria. Only a 
few yarieties were fully described. 
