( Para Rubber Tree): Bud- Sc ales serving as Nectaries. 225 
leaves mature, their own nectaries become functional, and the scale ones 
being no longer required wither and drop off. 
8. This case of Hevea brasiliensis is the first striking instance recorded, 
as far as the author is aware, of bud-scales — cataphyllary leaves — serving 
solely as nectaries. 
Postscript. 
Just on the completion of this paper a communication on the extra- 
floral nectaries of Hevea , read before the Academy of Sciences, Paris, on 
November 9, 1903, came to my notice. The article 1 resulting from it in 
the corresponding number of the ‘ Comptes Rendus ’ deals wholly with the 
structure of the petiolar nectaries, and makes no reference whatsoever to 
the nectariferous bud-scales ; hence the chief subject-matter of my paper 
is not in the least affected. The authors state that the number of indi- 
vidual glands composing the petiolar nectary of Hevea brasiliensis may 
vary between two and five, but is usually three. They point out that the 
secretory epidermis of the nectary is two-layered in places, and lay stress 
on the two following structural features: (1) the presence of a ring of 
lignified parenchyma in the interior of the raised border which surrounds the 
secretory surface of each gland ; (2) the laticiferous tubes, occurring in fair 
abundance in the specialized parenchyma of the gland, either end just 
below the secretory epidermis, or even pass between the epidermal cells to 
the exterior. J. P. 
Cambridge, December , 1903. 
1 Daguillon et Coupin, Sur les nectaires extra-floraux des Hevea , Comp. Rend, cxxxvii, 
No. 19, 1903, pp. 767-9. 
