BY ALEX. G. HAMILTOX. 763 



{ib. p. 447); the leaves of Vilis oblongata " with two large glands 

 underneath in the axils of the lateral veins": the leaflets of V. ster- 

 cuHfoIia " with glands or foveolese in the axils of some of the 

 primary ^eins underneath " {ib. p. 450). He also mentions 

 " glands " on the leaves of V. Baudiniana. 



Recently G. de Lagerheim has described some new acaro- 

 domatia (2) in Sul'dinm jasminoides and S. pseudoquina, and he 

 I'efers to the descriptions in De Candolle's Prodromus as evidence 

 of several other species being domatia-bearing : he also discusses 

 a new form of domatium in some plants of the genus Ceslrum.. 



A great part of the observations recorded below were embodied 

 in a paper read at the Meeting of this Society in ISTov ember, 1895, 

 but as at this time I was not aware of LundstriJm's paper, I was 

 allowed to withdraw it for the purpose of re-writing with a know- 

 ledge of that author's work. 



The domatia that have come under my notice consist of hollows 

 in the under surface of the leaf, and always occurring in vein 

 axils. They are usually roofed over either by an extension of the 

 leaf tissues, or by hairs. They are distinguished by peculiarities 

 in the minute structure of the part of the leaf lying over them. 

 Those that are known to me I divide into groups according to 

 their outward structure as follows : — 



Grouj) i. — Circular lenticular cavities on the under side of the 

 leaf, each with a small opening and a thickened rim. Those 

 found in Penaantia Cinininghamii present the highest develop- 

 ment of this type which I have seen. 



Group ii. — Pouches formed by a widening of the pi'incipal and 

 lateral veins at the axils, the space being filled in with tissue so 

 as to form a triangular pouch or pocket. To this group belong 

 the domatia in Dysoxylum FraserianuTn. 



Grovp Hi.— Depressions or hollows formed by a thinning of 

 the leaf substance at the axils. Of this type Viburnum chinense 

 furnishes the best example. 



Group iv. — Bunches of hairs in the axils proceeding from the 

 principal and secondary veins, such as are found in Eubus J/oorei. 



