1895.] 



Presents. 



183 



Fate of starch shed into an incision. Removed from slowly 

 dying parts. 



(b) Healing by primary adhesion with partial separation of the 

 faces of the incision from tension. 



(1) Without sclerosis. In Faba vulgaris, without cork formation 

 exposure, the incentive to production of cork. Effusion of 

 eoagulable latex in petioles of Eheum, a hindrance to union. 



(2) With sclerosis of the callus cells. 



Secondary Adhesion. — The process that may be compared with 

 that so named in animal pathology, viz., union occurring between two 

 surfaces previously healed by cork from exposure. 



Two varieties: (1) Union between the living cork-cells. 



(2) Union by indifferent perenchyma after disrup- 

 tion of the cork. 



The first observed in the aerial roots of Philodendron. The second 

 in Echinocactus ; not the final stage of union in the callus formed 

 from the cambium after stripping of bark or amputation in exo- 

 genous shrubs and trees. 



Callus growth observed in rare cases from the medullary rays 

 after exposure of wood. Union by secondary adhesion in grafting. 



The healing of incisions in plants corresponds, therefore, in general 

 with that by primary and secondary adhesion in animal textures. 



The analogy with secondary adhesion in the latter is not exact, 

 however, because the two surfaces which coalesce are first healed by 

 cork-tissue ; in animals they remain granulating till brought 

 together. 



Presents, December 12, 1895. 



Transactions. 



Acireale: — Accademia di Scienze, Lettere e Arid. Atti e Rendi- 

 conti. Vol. VI. 8vo. Acireale 1895. The Academy. 



Bucharest : — Societatea de Sciin^e Fizice. Buletinul. Anul TV. 

 Xos. 9 — 10. 8vo. Bucuresct 1895. The Society. 



Buitenzorg: — Jardin Botanique. Annales. Vol. XII. Partie 2. 

 8vo. Leide 1895. The Garden. 



Frankfort-on-the-Oder : — Xaturwissenschaftlicher Verein. Helios. 

 Jahrg. XIII. Xos. 1—6. Svo. Frankfurt a. 0. 1895 ; Socie- 

 tatnni Litterse. Jahrg. IX. Xos. -1 — 9. Svo. Frankfurt 

 a. 0. 1895. The Society. 



Heidelberg : — Universitat. Akademische Schriften. 1894-95. 

 8vo. The University. 



