Morphologie, Befruchtung, Teratologie, Cytologie. 627 



ineme temps que s'agglomere la matiere des cristalloides, celle des 

 globoides forme des amas mamelonnes, particulierement volumineux 

 ■dans l'assise sous-epidermique des cotyledons; 3° dans le Lupin, les 

 granules metachromatiques se repartissent sans s'agglomerer dans 

 la substance oü ont d'abord disparu les grains d'aleurone. 



Les globoides peuvent exister en dehors des grains d'aleurone 

 dans les teguments et dans les autres tissus de la graine. Des gra- 

 nules d'une substance analogue se rencontrent d'ailleurs dans les 

 assises nourricieres de Fanthere. 



La plupart des reactions fondamentales de la volutine indiquees 

 par A. Meyer se reproduisent avec les globoides, mais quelques 

 autres ne sont pas identiques dans les deux cas. II est logique de 

 conclure que Ton a affaire ä des substances voisines l'une de l'autre, 

 mais non identiques. II y a des volutines et non une seule volutine. 



C. Queva. 



Bruce, A. N., On the Distribution, Structure and Function 

 of the Tentacles of Roridula. (Notes of the Royal Botanic Gar- 

 den, Edinburgh. W. XVII. 1907. p. 83-98. with 2 plates.) 



A detailed account of the external appearance and structure of 

 the leaves of R. Gorgonias and R. dentata are given with special 

 reference to the distribution of tentacles. The tentacles are similar 

 in structure in both species. In the larger ones the pedicel consists 

 of three cell-rows but vascular tissue is absent. The ovoid head is 

 similar in structure to the pedicel and is covered externally with 

 glandulär cells which are united to the anterior cells by their inner 

 surfaces but are free from each other laterally: there are no poses 

 for the extrusion of the secretion. In the smaller tentacles the num- 

 ber of cell-rows is diminished, the smallest consisting only of one 

 <:ell-row the lower cells of which are elongated to form the pedicel 

 while the upper cells are flattened to form the glandulär head. 



The tentacles are droseraceous in structure and show more pri- 

 mitive features than the other genera of the family. A series sho- 

 iving gradual increase of complexity is described. In the largest 

 tentacles occurring just behind the apex of the leaf there is some- 

 times a slight development of tracheid tissue and in the tentacle 

 terminating the leaf the tracheids extend halfway up the pedicel. 

 The tentacle of Drosera can be considered to be derived from a 

 type resembling that of Roridula. Confirmation of the view that the 

 lower part of the tentacle of Drosera represents a Prolongation of 

 the leaf is supported by the terminal tentacle of Roridula, of which 

 the basal part of the tentacle is- a part of the tissue of the leaf, 

 while the upper part is of the nature of a hair. The power of mo- 

 vement of the tentacle is absent in Roridida and in Drosera is 

 limited to the basal part. The tall marginal tentacles are probably 

 losing their digestive function and becoming of the nature of 

 catching tentacles: sessile glands are absent from thr leaf. 



The primitive form of droseraceous tentacle was a hair and the 

 sessile glands of Drosophylhim were probably derived from the 

 pedicellate form. In Drosophylluni the stalked tentacles probably 

 function for attracting insects while digestion is carried on by the 

 sessile glands. 



Albumin placed on the glands situated at the back of the midrib 

 was completely digested but no digestion took place at the leaf 

 ma'rgin. The structure of the stem and root is also described. 



M. Wilson. 



