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Eucalyptus knives arc unarmed, so far as any mechanical means are concerned, 

 such as spines, thorns, or stinging hairs. At the same time, most of them are effectively 

 protected by their essential oils and fibre from attacks by the grazing anim-ds which 

 have been brought to Australia by the white man. Some exceptions are enumerated 

 in the paper referred to below, and there is no doubt that, in time, such animals 

 will develop increased toleration for these leaves. 



On the other hand, some of the indigenous animals have developed a fondness 

 for leaves rich in oil ; indeed, the Native Bear, which is often kept as a pet, has a very 

 decided taste for highly aromatic species. (The subject of the attractiveness, as 

 fodders, of Eucalyptus leaves to native and introduced animals, is referred to in my 

 " Forest Flora of New South Wales," Part LXX, p. 452.) 



Coats of hairs are of great use as protections or screens to the young foliage 

 leaves when they first emerge from the buds. The leaves of a great number of plants 

 are only hairy during the earliest stages of development. (See notes on Anthocyanin, 

 p. 331.) 



On the foliage leaves of quite a number of species there appear felted stellate 

 hairs which fall off as soon as the epidermis is sufficiently thickened. 



The Stringybarks (E. capitellala and allies) have the double protection of some- 

 what harsh leaves, and of stellate hairs in the young state. 



Glands are probably incipent hairs as Naudin suggests, and sometimes they may 

 be called stellate glands. It is not always possible to make a line of demarcation between 

 glands and hairs. No doubt the subject of hairs and incipient hairs in Eucalyptus 

 will engage the attention of a special investigator. 



The parts of the leaf on which hairs (when present) are usually found, are the 

 rachis, petiole, midrib, secondary and marginal veins. In the case of those species 

 which arc copiously hairy, the minute, reticulate veins are more or less covered. 



A. Stellate Hairs. 



(a) Leaves more or less crinkled and hairs all over. These are Stringybarks :— 



E. agglomerata. E. capitcllata. 



E. alpina. E. eugenimdes. 



E. Blaxlandi. _ E. ligustrina. 



E. Camfieldi. E. macrorrhyncha. 



(b) Hairs chiefly on edges of leaves, but variable. These (except E. leptopftleba 

 and regnans) are Stringybarks : — ■ 



E. Icevopinea. E, Muellerianu. 



E. Laseroni. E, regnans. 



E. leptopMeba. 



(c) Other Renantherse : — ■ 



E. apiculaia. E- obtusiftora, 



E. hcemastoma. E. virsata. 



K 



