1904.] Artificial Hatching of Chickens. 139 



room. The maximum and minimum outside temperature, 

 the morning temperature and humidity of the atmosphere,, 

 and the afternoon temperature in the incubator room on a 

 number of selected days from March 12th, 1903, to March 30th, 

 1904, are shown in Table I. On April 16th, 1903, when 

 6\ degrees of frost were registered, the inside air did not fall 

 below 59 Fahrenheit, and on January 23rd, 1904, when 9 degrees 

 of frost were registered, the inside temperature was 45 Fahrenheit. 

 On the other hand, on the hottest day recorded, July 2nd, 1903^ 

 when a maximum temperature of 89 degrees is given, the 

 inside temperature was not above 78 Fahrenheit. The varia- 

 tions of temperature in the room were as follows : — 



Month. 



April 

 May 

 June 

 July 



August 



January . 

 February 

 March . 



1903. 



1904. 



Highest 



Lowest 



Temperatures. 



Temperatures. 



° F. 



0 F. 



69 



57 



76 



62 



82 



57 



82 



60 



73 



60 



54 



4 a 



59 



47 



65 



46 



For these observations four classes of machine were used, 

 namely, A, Hearson's Champion ; B, Tamlin's Nonpareil ; 

 C, the Cypher's; and D, the Clive. A, B, and C are well known 

 representing two types. A and B are provided with tanks,, 

 and have bottom ventilation ; C is a hot-air, non-moisture 

 machine, in which the circulation is downwards. The Clive (D) 

 is a new form of incubator sent for trial. At the College 

 Poultry Farm the machines are worked by students, under 

 supervision of the practical instructors, Messrs. T. & W. Brown, 

 but in the case of the Clive it was operated entirely by the 

 instructors, and some at least of its success may be attributed to 

 expert control, as its regulation was not nearly so steady as in 

 the others. From May 23rd to June nth, 1903, the variations 

 recorded in the last-named machine were from 94 degrees to 101 J ; 

 and from June 18th to July 8th, 1903, from 94 degrees to \02h. 

 Table II., on page 141, gives the record of each machine 



