170 THi; MINUTE ANATOMISTS 



Medullary Rays 



Grew had a good anatomical notion of the medul- 

 lary rays of the dicotyledonous stem ; he calls them 

 " insertions," because they are inserted or wedged into 

 the wood. He remarks their continuity with the 

 cortex and pith, their use in bracing together the rings 

 of the wood, and their emergence from the outside 

 of the woody cylinder (pp. 12, 20; PI. Ill, Fig. 8; 

 PI. XXXVII). 



Hooks for Climhing 



The use in climbing of the hooks of bramble and 

 cleavers is described (p. 149). Mention is also made of the 

 wings and feathers of fruits or seeds, and of plants which 

 spurt or sling away their seeds ; in short, Grew gives 

 a preliminary sketch of the account of dispersal which 

 Linnaeus was able to furnish in 1751 {infra, p. 322). 



Buds 

 The security of the axillary position, the protection 

 and economy of space gained by the imbrication of the 

 bud-scales, and by the folding of the foliage-leaves, 

 various modes of leaf-rolling, and the defence of leaves 

 by means of hairs are dwelt upon (pp. 145-9). Grew 

 points out that buds are formed months before they 

 expand (p. 157), and mentions the burying of the 

 sumach-bud in the cortex of the branch (pp. 146-7). 

 "A bulb is, as it were, a great bud under ground" 

 (p. 58). 



Stomates 



He notes the occurrence of " orifices or passports, 

 either for the better avolation of superfluous sap, or the 

 admission of air" (p. 153). By a strange oversight he 

 says that the stomates are found only on the upper 



