Long cultivated in Barbary, in the south of Switzerland and elsewhere, it has never been found wild. In the different provinces of Spain it has no less than fifteen names,[1814] and none are derived from the Arab name _quemah_ used in Algeria[1815] and Egypt.[1816] The absence of names in several other countries, especially of original names, is very striking. This is a further indication of a derivation from the common wheat obtained in Spain and the north of Africa at an unknown epoch, perhaps within the Christian era. +4. Polish Wheat+—_Triticum polonicum_, Linnæus. This other hard wheat, with yet longer grain, cultivated chiefly in the east of Europe, has not been found wild. It has an original name in German, _Gäner_, _Gommer_, _Gümmer_,[1817] and in other languages names which are connected only with persons or with countries whence the seed was obtained. It cannot be doubted that it is a form obtained by cultivation, probably in the east of Europe, at an unknown, perhaps recent epoch. _Conclusion as to the Specific Unity of the Principal Races of Wheat._ We have just shown that the history and the vernacular names of the great races of wheat are in favour of a derivation contemporary with man, probably not very ancient, from the common kind of wheat, perhaps from the small-grained wheat formerly cultivated by the Egyptians, and by the lake-dwellers of Switzerland and Italy. Alefeld[1818] arrived at the specific unity of _T. vulgare_, _T. turgidum_, and _T. durum_, by means of an attentive observation of the three cultivated together, under the same conditions. The experiments of Henri Vilmorin[1819] on the artificial fertilization of these wheats lead to the same result. Although the author has not yet seen the product of several generations, he has ascertained that the most distinct principal forms can be crossed with ease and produce fertile hybrids. If fertilization be taken as a measure of the intimate degree of affinity which leads to the grouping of individuals into the same species, we cannot hesitate in the case in question, especially with the support of the historical considerations which I have given. _On the supposed Mummy Wheat._