286 T. H. Morgan 
of those that become full size is not more than half this number. 
Although, potentially, of course, each egg must be looked upon as 
having the possibility, its fate is determined by the condition 
of nourishment of the stem-mother. A few of the later laid 
eggs produce the dwarfs, the rest begin to develop but do not 
hatch; they may be found in older galls, turned black and on the 
road to decay, an astonishing fact, 1n itself, possibly connected with 
the enormous productivity of their sisters that mature—a point dis- 
cussed later. 
There is an interval of four days between the observations 
recorded in the last table and those given in the next table, II, (June 
8). In this interval a large number of sexual eggs have been laid 
in the large galls. It is noticeable that the number of supernumer- 
ary females has increased very little, indicating that the later laid 
eggs of the stem-mother do not hatch. 
Tt will be seen that only eight winged individuals were found in 
these thirty-two galls. ‘The galls were still closed so that there can 
be no question of their escape. The wingless individuals must 
be very prolific, as shown by the number of sexual eggs found in 
some of the galls where few wingless forms are recorded. Some 
deduction must be made, however, for small eggs recorded as 
male eggs, since these are mixed with stem-mother eggs still 
present. ‘The size of the male eggs and of the stem-mother eggs is 
so nearly the same that their record is here combined.® 
Even at this time the very small galls produced by late arrivals 
contain very few eggs or immature individuals (in addition to the 
stem-mother, not recorded in the count). In one case (No. 200) 
there was present in a very small gall only an immature stem- 
mother. In another case (No. 174) there was present one imma- 
ture apterous form, three eggs.and one dwarf, showing that the 
latter must have developed from a stem-mother’s egg, since 
the second generation was not yet mature. Other similar cases 
have been found. 
*In the table ‘‘total,” third column includes immature individuals and stem-mother eggs. Male 
and female eggs, seventh and eighth columns, also include whatever stem-mother eggs have not yet 
hatched. Such eggs would fall into the ‘“‘male” column which is therefore too great. The stem-mother 
is not counted in with the total. 
