Note on Certain Intumescences in Roots, 
3 2 5 
Tannin is present in considerable quantity. It was not possible 
to localize the secretion by means of micro-chemical tests, as the 
whole of the cells had become impregnated with it. 
Summary. 
In connection with the anatomy of the Euphorbiaceae the 
following points in the structure of the leaf of Colliquaya odorifem, 
Molin. appear worthy of notice. 
1. The occurrence of large glandular structures on the leaf- 
teeth. These retain their functional activity until the leaf is mature. 
2. The leaf is bifacial with a two-layered palisade region on 
the upper side, not centric with a three-layered palisade region on 
both sides as Herbert reports. 
3. A definite hypoderm is present near the leaf-margin. 
Herbert found hypoderm among the Hippomaneae only in species 
of Gelonium and Exccecaria. 
4. The chief development of stomata is on the upper surface. 
5. The occurrence of three kinds of secretory element, (a.) 
Latex tubes (ungegliederte Milchrohren). ( b.) Idioblasts with latex, 
(c.) Ordinary cells of the palisade-tissue and spongy-tissue which 
perform the secretory function. 
I am indebted to Mr. F. J. Lewis, M.Sc., F.L.S., for the 
material, and also for kind suggestions and criticisms. 
NOTE ON CERTAIN INTUMESCENCES IN ROOTS. 
T has often been shown that, in the case of injury to the epi¬ 
dermal tissues of shoots, the cortical cells underlying the 
wound elongate towards it. Also, intumescences in leaves are 
regarded as a wound response (Cf. Dale, Phil. Trans. B Vol. 198, 
p. 221 and the literature there quoted). Experiments show that a 
similar reaction occurs in the cortical cells of roots. 
