182 M. F. GUYER AND E. A. SMITH 
Experiment 20 
Twelve fowls and five rabbits were used as set forth in table 4. 
Although all of the rabbits had been observed to mate, only two 
of the five bore young. It was not determined whether the fail- 
TABLE 3 
Experiment 15 
I. Sensitization of fowls 
pami1018) | rrcaimcgmpamy |) ear a Grmemoem) |< FOR Gia ll: (nOneeens 
i, 0] Se Sec Un pan)” huge oil aia en een 
April 20 3 6 (half-grown) 10 3.0 
April 27 3 6 10 3.0 
May 4 3 6 10 oe0 
May 11 3 6 10 3.5 
May 18 3 6 10 335 
Il. Treatment of rabbits 
IDENTIFI- 
< CATION DAYS DOSE OF 
DATE OF INJECTION NUMBERS | PREGNANT SERUM REMARKS 
OF RABBITS 
May 30 20 9 5 Mating, 20 X 2 
A ? 5 Mating, A X 2 
June 1 20 11 5 
A ? 5 
June 6 20 16 5 
A I 5 
June 10 20 19 5 20—obviously pregnant; young 
died in utero 
A i 5 A—developed paralysis of hind- 
legs; died, June 22 
ure of nos. 11 and 20 to have young was due to lack of impreg- 
nation at mating or to death of the young in utero. After the 
fifth injection no. 22 became very ill, and on December 19th she 
was killed. Dissection showed the uteri to be filled with pus. 
There was no trace of young. If any had been present at first 
