A GUIDE FOR KEEPERS OF POULTRY 189 
feat an enemy. Guineas are coming out of the orna- 
mental class and making a place for themselves on farms 
in many parts of the country. 
HENS VS. INCUBATORS.—Some very interesting 
comparisons between hens and incubators for hatching 
and breeding chicks were made by Prof. Dryden when in 
charge of the Utah Experiment Station. A summary of 
these experiments gives the following results: 
From 879 eggs set, incubators hatched 533 chicks, or 
60.6 per cent. From 279 eggs set, hens hatched 219 
chicks, or 78.8 per cent. 
Eliminating eggs broken in the nests, the hens hatched 
88.2 per cent of the eggs set. The incubators hatched 
78.5 per cent of the fertile eggs set, and the hens 96.5 
per cent. Eggs incubated artificially tested out 22.7 per 
cent infertile, while those incubated by hens tested out 
11.8 per cent infertile. The incubators showed 16.6 per 
cent dead in the shell and the hens 2.8 per cent. Chicks 
hatched under hens weighed heavier than chicks hatched 
in incubators. The mortality of hen-hatched chicks 
brooded in brooders was 10.8 per cent in four weeks, and 
of incubator hatched chicks 33.5 per cent. The mortality 
of hen-hatched chicks brooded under hens was 2.2 per 
cent and of incubator chicks 49.2 per cent. In other tests 
the mortality was 46.5 per cent for incubator chicks 
brooded by hens and 58.4 per cent brooded in brooders. 
Hen-hatched chicks made a greater gain in weight than 
incubator chicks whether brooded by hens or brooders. 
In all these tests the eggs used were from the same breed- 
ing vards, and alike in every respect. 
These conclusions are derived from several separate 
tests during the whole of the hatching season, and are 
averages of the several tests. The tests were made at an 
