SENSIBLE PERSPIRATION, 18Q 



resinous exudation of Lombardy Poplars, 

 Populus dilatata, Ait. Hort. Kcw. v. 3.406, 

 which he supposes to be the tears of Phaeton s 

 sisters, who were transformed into those trees. 

 Such exudations must be considered as effu- 

 sions of the peculiar secretions ; for it has 

 been observed that Manna may be scraped 

 from the leaves of Fraxinus Omits, FL Grac. 

 t. 4, as well as procured by 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- 

 wi^e the Hop, according to Linnaeus, Fawn 

 Suec. 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, Fhalcena Hiimuli, upon its 

 roots. In such case the saccharine exudation 

 must decidedly be of a morbid nature*. 



* I do not mean to dispute the accuracy of Mr. Cur- 

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



