304 Bibliographical Notices. 



whole genus in time is thus made evident. The student is recom- 

 mended to take each group of animals as indicated by the curved or 

 vertical lines of separation* by itself, as the object of the Chart is 

 to show him how each tribe or order has been gradually developed 

 and perfected, or otherwise, in its course. By taking, then, the 

 genera and species belonging to the lowest formation first, he will 

 the more readily see what changes have been introduced among a 

 particular set of animals ; and having made himself thus master of 

 the separate groups, he will be able afterwards better to see their 

 mutual relations." 



Genera Plantarum : auctoribus G. Bentiiam et J. D. Hooker. 

 Vol. i. Pars 2. London, 1865. 



We have much pleasure in announcing the publication of another 

 Part of this admirable work. It consists of 293 pages, and contains 

 the genera included in the orders Leguminosse, Rosacea^, Saxifrageae, 

 Crassulaceac, Droseracese, Hamamelidese, Bruniaceee, Haloragese, 

 Rhizophorece, Combretacese, and Myrtaceae ; and we are informed 

 that a third Part will complete the Polypetalous orders and the first 

 volume. It is much to be desired that no great delay may attend 

 its publication. 



It is scarcely possible to give any idea of the amount of labour 

 which has been expended upon this work, which must form a neces- 

 sary part of the library of every botanist. We have looked rather 

 hastily through the present part, and observe very few points re- 

 quiring notice. In Legurninosce the Genistea?, Trifoliese, and Loteaj 

 are regarded as tribes of the Papilionacca?, and of equal rank with 

 Vieieee and Iledyracese ; and, amongst the genera, ISarotliamvus is 

 combined with Cytisus, Arthrolobium with Ornitkopus, Ervum is 

 joined to Vicia, and Orobus to Lathyrus. The order Rosaceoe is 

 retained entire, notwithstanding the apparently epigynous structure 

 of the Pomete. Amongst its genera, Potentilla includes Sibbaldia, 

 Agrimonia includes Aremonia, Poterium includes Sanguisorba, 

 Pyrus includes Mespilus. The Grossulariacese are combined with 

 the Saxifrages, and also the genus Purnassia. The genus Calli- 

 triche is placed in Halorageae, but Ceratophyllum is considered to 

 constitute a Monochlamydeous order. 



There arc many other alterations made in the usual mode of 

 grouping, but we do not think it necessary to mention them. 

 Those enumerated are of the most interest to the British botanist, 

 as relating to the flora of his own country. 



We have only to add that all botanists must feel anxious for the 

 early continuation of this very useful work, and express our hope 

 that its sale may be such as to encourage the learned authors to 

 proceed as rapidly with its publication as they properly can. 



* The groups may be made more distinct by colouring the lines by 

 different paints or crayons. 



