SENSIBLE PERSPIRATION. 189 



resirous e>udation of Lonibarcly Poplars, 

 Populus dilatata, Ait.llort. Kcw. t'. 3. 406, 

 which he supposes to be the tears of Phaeton s 

 sisters, who were transformed into those trees* 

 Such exudations must be consi 'ered as effu- 

 sions of the pecuhar secretions ; for it has 

 been observed that Manna may be scraped 

 from tlie leaves of FraxhuisOriiiis, FL GrcBc. 

 t. 4, as well as procured b}^ incision from its 

 stem. They are often perhaps a sign of un- 

 healthiness 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 sub- 

 ject, and which, in consequence of an un- 

 favourable wind, covers its leaves in the form 

 of a sweet exudation, similar in flavour to 

 the liquor obtained from its trunk. So like- 

 wise the Hop, according to Linnaeus, Fmiii. 

 Slice. 305, is affected with the honey-dew, 

 and its flowers rendered abortive, in conse- 

 quence of the attacks of the caterpillar of the 

 Ghost Moth, Fhalccna Hiimuli, upon its 

 roots. In such case the saccharine exudation 

 must decidedly be of a morbid nature *. 



* T do not mean to dispute the accuracy of Mr, Cur- 

 tis's excellent paper, Tr. of Linn. Soc. v. 6, written to 



