POULTRY LABORATORY GUIDE 27 



turned low for a few moments until it bums 

 up and then it may be safely turned to the de- 

 sired height. Never leave lamp flame turned up 

 high enough so that there will be any danger from 

 smoking. Keep flame the same and do all regu- 

 lating by the thumb nut, except in some cases the 

 lamp wick will need turning down on the nine- 

 teenth day. Why? Do not allow any drafts 

 of air to blow directly on the lamp. 



On the evening of the third day take out the 

 eggs and tm-n them, continuing this process 

 twice a day morning and night until the evening 

 of the eighteenth day. What are the objects 

 of turning? Change the position of the trays 

 regularly to admit of all the eggs being subjected 

 to a uniform temperature. 



In cooling the eggs the operator must be 

 governed by the temperature of the room and 

 the season of the year. In general it will be safe 

 to start cooling on the fifth day and cool five 

 minutes if the temperature of the room is above 

 sixty "degrees. Eggs require less cooling in cold 

 weather, the time required for turning usually 

 being sufficient. Gradually increase the length 

 of time for cooUng until during the last week of 

 the hatch they may be cooled for over twenty, 

 minutes under favorable conditions. What are 

 the objects of cooling ? Stop turning and cooling 



