190 NOTICES OF BOOKS. 
sepals: whilst in the blue sweet violets, and in another form with 
flowers of a reddish-purple hue, he had as uniformly found the sepals 
to be quite entire. From these observations the author suggested that: 
the white sweet violets, usually regarded as a mere variation of colour, 
might perhaps prove a &oná fide variety, assuming the blue sweet violet 
with entire sepals to be the typical form of Viola odorata. In this 
view of the relations of the native sweet violets, the white, and the 
lilac-flowered fringed-sepaled plants would be considered as forms of 
a variety, to which the name ciliata would be appropriate ; whilst the 
blue entire-sepaled plant would be regarded as the type of the species. 
It was mentioned that the white sweet violet had been set up by some 
botanists as a species distinct from 7. odorata. Specimens of both 
forms were exhibited. 
NOTICES OF BOOKS. 
De CANDOLLE ; Prodromus Systematis Naturalis Regni Vegetabilis. 
Pars Decima tertia, sectio posterior sistens Monochlamydearum 
ordines quinque. 
We announce, with great pleasure, another volume, or rather portion 
of a volume, of this most important work, perhaps the most practically 
useful on the subject that has ever appeared,—commenced by M. 
Auguste Pyramus De Candolle, and continued with undiminished 
excellence by his well-instructed son, M. Alphonse De Candolle, with 
the aid of some of the most distinguished botanists of the day. 
The first part of the thirteenth volume is destined to contain the 
Solanacee, elaborated by M. Dunal of Montpellier, and the Planta- 
ginec, from the pen, if we mistake not, of M. Decaisne, but which are 
not yet prepared. The portion which is now published commences 
with the fourth subclass, Monochlamydee (from which, however, the 
Plantagineg, Plumbaginee, and Conifere are excluded). It in- 
cludes the Phytolaccee, reckoning twenty genera, by M. Moquin-Tan- 
don: Salsolacee (Chenopodee of most authors), sixty-two genera; 
Basellacee, six genera ; and Amarantacee, forty-five genera: all by 
Moquin-Tandon ;—and lastly, Nyctaginaceg, by M. Choisy. 
