750 Tsabel McCracken 
acter as such. ‘The later history of this lineage throws much 
light on this point. 
It so happened, somewhat by accident and somewhat by 
design, that there were 34 matings made in the spring of 1905, 
(out of the total number of 210 matings) in which one or both 
parents were taken from this brood. 
These matings were distributed as follows: 
Series A 24 matings of univoltin 9 (pure) x hybrid uni(bi)- 
voltin 3 
Series B- 5 matings of hybrid uni(bi)voltin ¢@ x hybrid uni- 
(bi)voltin 3 
Series C 5 matings of hybrid uni(bi)voltin 2 x univoltin 
(pure). 
Full lots of eggs were obtained from each mating, namely, 34 
masses of eggs. In June about 15 days after the eggs were 
oviposited, when a close inspection of the eggs was made, all of 
the eggs in Series A had assumed the gray tone of the univoltin 
egg. Of the five broods of eggs secured in Series B, two broods 
had assumed the gray appearance of the univoltin egg, while 
three broods failed to go into the univoltin condition but hatched 
at this time. Of the five broods of Series C, as in the previous 
series, two broods assumed the gray appearance of the univoltin 
ege while three broods hatched at this time. 
The results in these three series may be tabulated thus: 
TABLE I 
(A dash (—) in the second column indicates univoltin or failure to bivol! in the year designated. In 
succeeding tables, in the same column, plus sign (+) indicates bivoltin in the year designated) 
PER CENT 
TOTAL NUMBER | NUMBER 
| OF UNI- 
BROOD CONDITION OF PARENTS NUMBER or | aeoes VOLTS 
OF BROODS| BIVOLTS | UNIVOLTS 1905 
Series A....... O48 Sx By Ui(e 24 ° 24 100 
Series B....... —04 HyU(B)2 x HyU(B)c 5 3 2 40 
Series ence —o4 HyU(B)2xUO@ 5 gq || 40 
