175 
however, the following list is inserted for the convenience of those 
who may wish to note the necessary changes: 
Mariscus, Hall. (1742). = Cladium, P. Br. (1756). 
Cyperella, Cram. (1 744). == Juncodes, Adans. (1763). 
Ramaium, Rumpf. (1747). = Boehmeria, Jacq. (1763). 
Stellularia, Linn. (1748). = Stellaria, Linn. (1753). 
Leuconymphea, Ludw. (1737). = Castalia, Salisb. (1805). 
Nymphea, Ludw. (1737). = Nymphea, Salisb. (1805). 
Capnorchis, Ludw. (1737). = Bikukulla, Adans. (1 763). 
Cracca, Linn. (1747). = Colonilla, Adans. (1763).* 
Ricinocarpus, Burm. (1737). = Acalypha, Linn. (175 3). 
Stellaria, Ludw. (1737). = Callitriche, Linn. (1753). 
Lapula, Hall. (1745). = Lappula, Moench. (1794). 
Leptostachya, Mitch. (1 748). = Phryma, Linn. (1753). 
Pentagonia, Sieg. (1737). = Legousia, Dur. (1782). 
The rule which excepts duplicate binomials, as Phragmites 
Phragmites (Linn.) from the law of priority, is also gracefully ac- 
cepted, and wherever such binomials are found in the work the 
request is made that the second oldest specific name be used, 
although the author was not and is not now in sympathy with any 
such exception. The above binomial would thus become Phrag- 
mites vulgaris (Lam.). 
An exceedingly terse and sharp enunciation of the author's 
views in regard to the question of nomenclature may be found 
under the heading “ Citation of authors of genera and species ” 
beginning on p. 11, which is worthy of attention from all who still 
believe in the « position of naming-plants-as-one-pleases.”’ In 
tracing the history of the movement towards a stable system of 
nomenclature in America, Prof. Britton is given undue prominence. 
The argument was begun by Prof. Greene. 
In its general classification the work is not only well abreast 
of the times, but far ahead of all our manuals and text books. 
All schemes of classification are necessarily evanescent or at least 
_Should be sufficiently elastic to permit of interpolation or amend- 
ment whenever newly discovered facts render it advisable or neces- 
Sary, and, as the author says: “ While, therefore, the constant 
shifting from one classification to another is exasperating to the 
* Cracca, L., appears in the “ Species Plantarum” of 1753, 
: : _ 
