34 ON THE GALLS OF TEREBINTHUS AND PISTACIA. 
small horn, but they gather it while very small, and sell it 
at a high price to dye fine silks in the town of Pruse ( Sin- 
gulariter, book i., c. 65.) They use annually above 6000 
pounds of these galls. They are hollow within, of the size 
of small Roman galls, growing on the leaves of the male 
terebinth. When they are not gathered, they grow half a 
foot long, and horn-shaped {ibid, book hi., c. 49.) Belon, 
as it would appear, believes that all the galls of terebinth 
form one species, and that they only differ from their age ; 
but it is probable, as is the case with the galls of the oak, 
that different parts of the terebinth may be impregnated by 
different insects, and produce galls quite distinct. I do not 
pretend to conclude from this that the three galls which I 
possess are due to the terebinth. I believe them, on the 
contrary, to be produced by a different tree. 
Lobel, whom I have already quoted, has published two 
other figures of Pistacias, with horn-shaped galls. One of 
these {Observations, page 539,) borrowed from Dodonaeus, 
is given as a pistacia, and the gall in fact resembles that of 
the pistacia, but the tree appears to me to be a Terebinthus. 
The other figure, much better done, is found in the Adver- 
saria, p. 12. This tree is a true pistacia (Pistacia narbo- 
?iensis, L.,) bearing two sorts of galls, one in the form of a 
spindle, nearly straight and lengthened to a point at the ex- 
tremity ; the other, short, angular, rounded, and double. 
The spindle-shaped or horn-shaped gall, is very probably 
the second sort which I have to describe, and the small 
double gall is perhaps the young state of the third sort to 
which belong the galls of the pharmacien of Bourgtheroulde. 
After having thus established, as far as it is possible, the 
origin of these three galls, I proceed to describe them. 
1st sort : Horn-shaped Gall of the Terebinthus. — Re- 
presented in the Observations of Lobel, page 538, and in 
the History of Rare Plants, by Clusius, page 15. This 
gall has the form of a long and flattened vesicle, enlarged at 
