62 BRITISH OAK GALLS. 
is pushed off by the growth of new wood in the follow- 
ing spring. 
When denuded of hairs the gall is seen to be longi- 
tudinally furrowed, but this may sometimes be dis- 
tinguished without the removal of the hairs, as in 
inset specimen. (Plate X.) 
When the gall is inhabited by an inquiline it does 
not attain its usual proportions. 
Internally the gall is divided into nearly equal parts 
by a septum, the lower portion being hollow, or filled 
with fibrous reticulations, the upper portion contains 
the true gall, which is adherent to the inner walls. 
Fic. 5.—Galls caused by Andricus glandulz. a. Young, showing leaf- 
scales, and “thatched” appearance. B. Mature. c. Longitudinal 
section. All x 2}, dele. ad nat. E.C. 
The larval chamber has a whitish interior and is ovoid 
in shape. 
I am not aware as to the distribution of this gall in 
Britain, whether it is plentiful or scarce; possibly it 
extends over wide areas and would be more frequently 
observed but for its brief period of growth, rapidity in 
reaching maturity, and then falling to the ground. 
It has occurred in all the districts in which I have 
searched, but it appears to be extremely local, and 
sometimes it will not be found on more than two or 
three trees in the same wood, and those widely 
separated from each other. 
According to my own observations it occurs mostly 
on oak bushes of eight to ten years’ growth, also on 
