346 PRINCIPLES OF BOTANY, ETC. 
likewise on the Salix, Cistus, Glechoma, Veronica, 
Hieracium, Salvia and other plants. 
The galls of Saivia pomifera, which got its name 
from that circumstance, are said to be of a pleasant 
taste, and considered as an excellent dish in the 
oriental countries. 
To remedy this affection, we can do nothing, but 
cut off the galls as soon as they appear. his how, 
ever cannot be done. in very delicate plants, if we 
wish to preserve them. ‘The disease in fact rarely 
proceeds such a length, as to hurt the plant ma- 
tertally. 
§ 315. 
The folliculus carnosus foliorum, 1s a gall of a par- 
ticular kind, which is subulate and acute. It is 
found i Populus zigra and Tilia europaea, and covers 
the whole surface of the leaf. It arises in the same 
way as the former, but being more frequent oftener 
produces disease. 
Contorsions, (contorsiones), owe their origin like- 
wise to insects, which produce a swelling of the 
leaves ; hence they become contorted, which is the 
characteristic feature of the disease. It occurs in 
Cerastium, Veronica, Lotus, Vaccmium. 
f § 816, 
Verrucae, or warts, are small tumours, which oc- 
cur chiefly in fruits, for instance, in apples. Here 
imsects are not the cause, but accidental occurrences, 
‘Of the same kind are the (naevi s. maculae), moles, 
‘They arise from wounds’of the cutis. Both diseases 
are 
