$40 hemarkable excrescences* 



inos.s-like balls, in whose internal parts nu- 

 merous maggots are always to be found, till 

 they become the winged Cynips Rosce, and 

 eat their way out. Many of our Willows 

 bear round excrescences, as large as peas, on 

 their leaves ; but I remember to have been 

 very much astoni.shed in Provence with a 

 fine branched production on the Willows in 

 •winter, which appeared like a tufted Lichen, 

 but proved on examination a real Gall. In- 

 deed our Salix Helix, t, 1343, is called Rose 

 Willow from its bearing no less remarkable 

 an excrescence, like a rose, at the ends of 

 some of its branches, in consequence of the 

 puncture of an insect, and these are in like 

 manner durable though the proper leaves fall. 

 The Mastic-tree, Pistacia Letitiscus, is often 

 laden, in the south of Europe, with large red 

 hollow linger-like bodies, swarming internally 

 ^ith small insects, the Aphis PistacicB of 

 Linnajus. The young shoots of Salvia po' 

 mifera, FL Gncc. t. 15, S^ triloba, t. 17? 

 and even «S. officinalis, in consequence of the 

 attacks probably of some Cynips, swell into 

 Jarge juicy balls, very like apples, and even 

 crowned with rudiments of leaves resembling 



