[December 
33 ^ 
1 would offer the following facts in support of this theory. The 
largest gall of C. q. Heminator and operator are always found to cover 
a cluster of buds, either at or near the tips of twigs, and the large 
number of cells found in some of these galls probably does not exceed 
the number of embryo leaves in the several buds. As seldom more 
than one or two of these buds are developed into leaves in the natural 
order of growth, the actual number of leaves on a given branch is very 
far short of the number that existed in embryo. 
On carefully dissecting a gall of either C. q. semmator or operator 
the cells are found attached, generally, to two or more centres, each of 
which is the axis of a bud. This axis is often considertxbly elongated 
in 0. q. operator, even passing out through the gall, and, in some 
cases, bearing a few dwarfed leaves. (I here speak of the galls of C. 
q. operator^ as I have found them on Q. ilicifolia and Q. palustris.) 
The axis of the galls of C. q. semmator are, so far as my observa¬ 
tions extend, less developed, though, of course, much larger than in 
the embryo state. When the axis is short the cells are often so crowded 
that many of them, especially the terminal ones, are raised on a pedicel. 
The long axis of the other species giving ample room, the cells are all 
sessile. 
Around each fascicle-like cluster of cells, but separated from the 
axis, are found the hud-scales of the original bud. These preserve all 
their characteristics as regards form, size and color, even to the hairs 
always present on the outside and edges.. 
The woolly fibres on the galls of C. q. seminator are attached to a 
lengthened beak of the cell,—quite above the place where the larva is 
found,—but in C. q. operator the beak is nearly or quite obsolete, and 
the whole cell is covered with the fibres. 
The long, hairy beak and polished base of the cell of G. q. seminator 
lead me to think that the larval egg is deposited in the petiole of the 
leaf, or at least the larva is developed there; while the larva of G. q. 
operator is developed in the blade of the leaf and the cell, is, therefore, 
covered with the pubescence of the leaf. 
I have not fully investigated the cell structure of the larval cell, but 
in a rather hasty examination, under the microscope, of the outer and 
inner surface of the celf I thought I could detect something of that 
difference of cell arrangement always existing between the upper and 
