19 



Dutrochet mentions a species of ash, whose branches, from 

 eight to ten years old, develope cork ; after this time the deve- 

 lopment of cork ceases. I have published similar observations 

 on the Metrosideri *, and have indicated the structure as also 

 the development of the suberose layer in relation to the other 

 cortical layers. The other statements of M. Dutrochet were 

 previously known. 



M. Decaisnef presented to the Acad. des Sciences a memoir 

 on the family of the Lardizabalece, which contains some in- 

 teresting observations on the structure of the stems of dicoty- 

 ledons, especially with reference to the Menispermece and Ari- 

 stolochice. As the memoir will probably very soon appear, 

 we delay our notice, as the abstract in the Institut is too short 

 for our purpose. The remarkable structure of the stem of the 

 genus Cissampelos has also been noticed by me in my Vege- 

 table Physiology, p. 3 74. 



M. Link has published the second part of his Anatomico- 

 Botanical Drawings for elucidating the fundamental doctrines 

 of botany J; they are accompanied with Latin and German 

 text. In last year's report I drew attention to this useful un- 

 dertaking, which must add much to the general diffusion of 

 phytotomical doctrines. The drawings are very neatly and 

 beautifully executed on stone, and in the present part there 

 are several which render the distinctions between monocoty- 

 ledons and dicotyledons, Coniferce, Cycadeae, and so forth, very 

 prominent, and on that account may be recommended to the 

 attention of geologists. 



M. Morren endeavours to show that the priority in the 

 discovery of the increase of cells by simple division belongs to 

 him, as he had published already in 1830 the observation, that 

 every fourth part of his beautiful genus Crucigenia (an Alga), 

 on being magnified, again subdivided into four smaller cells, 

 and so on. In last year's report this subject was treated of 

 at length, p. 20 1|, &c., and I stated M. Dumortier to be the 

 discoverer of this interesting fact, which was published in 



* Pflanzen-Physiologie, i. p. 411, &c. 

 t L'Institut, 1837, p. 317. 

 I Berlin, 1837, fol. 



Bulletin de 1'Acad. Royale de Science, &c. de Bruxelles, 1837, p. 300. 

 || Page 386 of the translation in the Lond. and Edinb. Philosophical Ma- 

 gazine for Oct. 1837. TRANSL. 



c 2 



