434 BIBLIOQEAPHY. 



Gaecke, a. — Die Stellung der Gattung Morina im naturlicheu Sys- 

 tem. Bonpl. 1861. p. 49. 



Confirming tlie received view, in opposition to that of the 

 late Dr. Klotzsch, that Morina is Dipsaceous, not Acanthaceous. 



Ueber Die Gattung Triclianthera. Ehrenb. Bonpl. 1861. 



p. 115. 



Stating the genus Trichantliera, Ehrenb. to be identical with 

 Sermannia, L. 

 Gaeeeau, L. — Eecherches sur la distribution des matieres minerales 

 fixes dans les divers organes des plantes. Ann. S.N. Ser. iv. xiii. 

 p. 145. With 1 plate. 



An account of experiments instituted with a view to ascer- 

 tain the chief causes determining the distribution of mineral sub- 

 stances in the various organs of plants, their comparative quan- 

 tity, and the part they play in the plant economy. The memoir 

 is divided into two portions ; the first treating of the inorganic 

 constituents of plants, the second devoted to the function of the 

 azotised ceU-contents, and the circidation of ceU-sap. Tables are 

 given of — (1) Tlie percentage of inorganic constituents in various 

 organs gathered at different periods ; also (2) in radicles and 

 fibrils which have vegetated at the expense of their seed in dis- 

 tilled water solely ; (3) in fibrils of aquatic and terrestrial plants ; 

 (4) in stems of various ages ; (5) in the pith and cambium -layer 

 of the elder ; (G) in the axes and fronds of cryptogams ; (7) in 

 leaves ; (8) in ripe seeds, as compared with ovules ; (9) analyses 

 of the ashes of seeds ; (10) of the axes and youngest leaves of 

 buds; (11) of the stems of trees, terrestrial and aquatic herbs, 

 the leaves of ligneous plants, of cryptogams, &c. 



The author shows the very unequal distribution of inorganic 

 constituents, and the remarkable variation in respect to their 

 amount in the different organs of plants. That while their pro- 

 portion in the axial organs of ligneous plants decreases vnth 

 lignification, in herbaceous species it increases with age. The 

 same accumidation takes place, as a rule, in leaves, with the ex- 

 ception of those specially modified, forming calyx, pericarp, &c. 

 The contrast is pointed out between the analysis of the seed, 

 deprived of episperm, and that of other parts of the matured 

 (monocarpic) plant. The former containing but the elements 

 constituting the phosphates of lime, potash, soda, magnesia ; the 

 latter oxides of iron, manganese, carbonates of lime and mag- 

 nesia, sulphates, chlorides, silica, &c. — phosphates having almost 

 entirely disappeared. In reference to the azotised contents of 

 cells, M. Garreau is of opinion that the threads (or canaux) of 

 protoplasm, which radiate from the nucleus, are in direct com- 

 munication mth the corresponding processes of adjacent cells, 

 and that thus the active formative matter, which possesses a 

 similar composition and fulfils Like essential functions with that 

 of animals, may remove itself from old or thickening cells. 



