98 
Journal of Agricultural Research 
Vol. XIV, No. a 
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In the spring of 1914, 
after the A series had been 
running for one year, fresh 
series of first-born and last- 
born individuals were begun 
from an individual taken 
from the field, and similar 
records made as to the length 
of life and number of young 
of the individuals constitut¬ 
ing the generations. These 
series, called the “B” 
series, were continued until 
the spring of 1915, or almost 
one year, after which they 
were discontinued and other 
fresh series started similar 
to the B series of the pre¬ 
ceding year. These series, 
known as the C series, were 
continued until the A series 
gave out completely. 
The purpose of conduct¬ 
ing the B series and C series 
was to solve part “b” of 
the problem by comparing 
results with those obtained 
in the A series 
APPEARANCE OF 
OVIPAROUS FORMS 
No oviparous fgrins ap¬ 
peared during the first year 
the experiments were in 
progress, the species breed¬ 
ing viviparously throughout 
that winter (1913-14). 
In the fall of the second 
year, however, all the last- 
born individuals of the 
seventeenth generation de¬ 
veloped into oviparous 
females. One individual of 
the line of generations of 
those last born in the B series 
in the late fall of 1914 also 
