Bibliographical Notices. 435 



combined, that it is quite impossible to say where the one ceases and 

 the other begins, and there is really no reason why we should be in- 

 credulous as to the possibility of the same object being at one time 

 endowed more especially with animal and at another with vegetable 

 life. Late observations on the reproductive bodies of some Algae 

 show that their motion is produced by vibratile cilia exactly in the 

 same way as in certain animals. But it is exceedingly difficult to 

 imagine the transformation of one real species into another. The 

 same species may assume a vast variety of forms according to varying 

 circumstances, and it is highly instructive to observe these changes ; 

 but that the same spore should under different circumstances be ca- 

 pable of producing beings of an almost entirely different nature, each 

 capable of reproducing its species, is a matter which ought not to be 

 admitted generally without the strictest proof. Observations made 

 with care on isolated individuals, and not on a common mass, which 

 can scarcely be otherwise than more or less heterogeneous, could not 

 fail to be instructive, and might lead to results, which, if they did not 

 confirm the views so commonly entertained in Germany, would have 

 an influence on science which it is difficult at present to appreciate. 



Annates des Sciences Naturelles. 



June 1844. — Zoology. — Conclusion of M. Duvernoy's memoir on 

 the P cecilia surinamensis (with a plate). — Mr. Darwin on Sagitta 

 (translated from the ' Annals of Nat. Hist/ no. 81). — M. Leon Dufour 

 on the metamorphoses and anatomy of Piophila petasionis (with a 

 plate). — A notice of the life of M. Geoffroy St. Hilaire. 



Botany. — Boissier, Plantse Aucherianse, sp. 140 to 187 (all Umbel- 

 lifer a). — Miquel on Beyeria, a new genus of Euphorbiacece. Char. 

 (Flores dioici apetali. Calyx 5-partitus. Antherce extrorsa?. Ovarii 

 loculi uniovulati. Stigma pileiforme integerrimum sessile.) Sp. typ. 

 Beyeria viscosa (figured) from Rottenest Island, on the S.W. coast 

 of New Holland. — M.Theod. Hartig, Contributions to the history of 

 the development of plants (a translation from the German), in part 

 an abstract. — Note on the organization and mode of fructification of 

 Onygena, by MM. L.-R. and C. Tulasne (with a plate ; all the draw- 

 ings of these botanists are highly instructive and very beautiful). — 

 H. Mohl on the growth in thickness of Dicotyledonous trees (a trans- 

 lation from the German). — Lemaire on Delairea, a new genus of 

 Synantherce. Sp. typ. Delairea odorata, probably from Mexico ? 



July 1844. — Zoology. — An elaborate memoir by M. Joly on the 

 habits, metamorphosis, anatomy and embryogeny of the Colaspis 

 atra, a little coleopterous insect which infests the lucern in the 

 south of France : with plates. — M. Letellier on the action of sugar 

 in the alimentation of Granivorse (from the ' Annales de Chimie '). 

 — A translation from the German of M. C, Vogt's observations on 

 the embryology of Batrachiens. — M. Gervais on the Myriapoda. 



Botany. — Unger on the Aclilya prolifera (translated from the 

 • Linnsea'). — M. Ad. Brongniart on the structure of the pistil and the 

 origin of ovules (see ' Annals,' no. 87). — Fourth series of notes (in 



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