Laws of Botanical Nomenclature. 65 
Art. 14. Modifications of cultivated species should, where 
possible, be classed under the wild or spontaneous species from 
ich they are derived. 
For this purpose the most striking are treated as subspecies, 
and when constant from seed, they are called races (proles 
Modifications of a secondary order take the name of varieties, 
and if there be no doubt as to their almost constant heredity 
cies, are indicated according to their origin in the following 
manner :—1. Satus (seedling ; Gall. semis ; Germ. Siimling), 
for a form obtained from seed. 2. Mistus (blending ;* Gall. 
métis ; Germ. Blendling), for a form arising from cross-fertili- 
zation in a species. 3. Lusus (sport; Germ. Spielart), for a 
orm originating from a leaf-bud or from any other organ, and 
propagated by division. 
On the manner of designating each group or association of plants. 
i Section 1. General Principles. 
Art. 15. Each natural group of plants can. bear in science 
but one valid designation, namely, the most ancient, whether 
adopted or given by Linneeus, or since Linneus, provided it be 
consistent with the essential rules of nomenclature. 
Art. 16. No one ought to change a name or a combination 
of names without serious motives, derived from a more profound 
* Since'the meeting of the Congress, the author of this pamphlet has, together 
with the translator, turned his attention to the choice of a significant English term 
for the French métis. The word blending does not perhaps indicate eo clearly 
e term 
enough the existence of a mixture, and does not allude to its 
half-breed, d by agriculturists, appea answer much better to the sense 
méetis; breed p plying a race, and half-breed the mixture of two races 
Tt may, however, likewise be suggested that the shortness of word 
métis, analo the Sp mestizo, and tly derived from the Latin 
tus, or miaxtus, will perhaps induce English botanists to adopt it, together with 
the word half- The latter i uw ressive, but metis has 
: d 
over it the advantage of being intelligible in several tongues. The term mule, as 
applied to the mixture of vari ties of races, is in constant use amongst English 
7 oinsed but is too obviously erroneous to be sanctioned by scientific writers. 
AM. Jour. Scr.—Szconp Serres, Vou. XLVI, No. 136.—Juxy, 1868. 
5 
