74 DISEASES OF DOMESTICATED BIRDS 
The significance of this is not apparent, but opens an interesting field 
for study, if the observations are accurate. 
If it is desired to breed from an infected flock for the purpose of 
perpetuating the particular strain of fowl, or for other reasons, pre- 
caution may be taken to minimize the losses by the following pro- 
cedure. Incubator trays, or shelves, of the pedigree type which are 
partitioned off into compartments capable of inclosing a few chicks, 
say from six to ten as the owner may decide, are to be used. The 
partitions are to be sufficiently high to prevent the chicks in adjacent 
compartments from coming in contact. This also means that the 
partitions should be of solid structure to prevent picking back and 
forth. It is only necessary to use such trays a day or two before 
the hatch is expected to come off, and for three days after it is com- 
pleted. The chicks are to be retained in their respective compart- 
ments and need not be fed for 48 or even 72 hours, since they are 
provided with food material during this period through the yolk 
which is drawn into the abdominal cavity previous to hatching. 
Should symptoms of disease develop, the chicks in the particular 
compartment are to be removed and disposed of. The attendant 
should then disinfect his hands before watering or caring for the 
others. As the disease is contracted principally during the first 48 
hours of life, and only to a slight extent during the succeeding 24, 
this method of procedure will prevent a general spread to the hatch. 
The temperature and air requirements may be regulated to suit the 
needs of the chicks. Humidity, due to close confinement and lack 
of air circulation, is to be guarded against. The trays may be re- 
moved to the brooders, or similar structures may be placed in the 
latter and the chicks transferred to them, with care to avoid mixing 
the segregated lots. After three days, the danger of infection is re- 
duced to a minimum, and all of the hatch may be allowed to run 
together. 
BACTERIUM PULLORUM INFECTION OF GROWN FOWLS 
Occurrence. Infection of hens by the organism in question is 
not marked by external changes nor is it regarded as a common 
cause of death. Jones reports one outbreak due to B. pullorum in- 
fection which assumed an acute character with marked symptoms and 
considerable mortality. In this case the fowls were infected through 
the feeding of eggs which had failed to hatch and which came from 
an infected flock. About 50 birds died during the outbreak. The 
