144 SENSIBLE PERSPIIIATION. 



vvnter tricide from their leaves like a slight shower of 

 rain. Sometimes it is of a saccharine nature, as De la 

 Hire observed in Oranf^e trees ; Du Hamel Arh. t\ 1 . 

 150. It is more glutinous in the Tilia or Lime-tree, 

 more resinous in Poplars, as well as in Cistus creticusj 

 from which last the resin called Labdanum is collected, 

 by beating the shrub with leather thongs. See Tour- 

 nefort's Voi/age, 29- In the Fraxinella, Dictamjius 

 albuSy it is a highly inflammable vapour. Ovid has 

 made an elegant use of the resinous exudation of 

 Lombardy Poplars, Fopidus dilatata^ Alt, Hort. Kezv. 

 V. 3. 406, which he supposes to be the tears of 

 Phaeton's sisters, w^ho were transformed into those 

 trees. Such exudations must be considered as effu- 

 sions of the peculiar secretions; for it has been' ob- 

 served that Manna may be scraped from the leaves of 

 Fraxinus Ornus, FL Grcec. t. 4, as well as procured 

 by incision from its stem. They are often perhaps a 

 sign of unhealthiness in the plant ; at least such ap- 

 pears to be the nature of one kind of honey-dew, to 

 which the Beech in particular is subject, and which, in 

 consequence of an unfavourable wind, covers its leaves 

 in the form of a sweet exudation, smiiiar in flavour to 

 the liquor obtained from its trunk. So likewise the 

 Hop, according to Linnaeus, Faun, Suec. 305, is af- m 

 tected with the honey-dew, and its flowers rendered 

 abortive, in consequence of the attacks of the cater- 

 pillar of the Ghost Moth, PhaUena Humidi, upon its 

 roots. In such case the saccharine exudation must 



