POULTKY LABOKATORY GUIDE 111 



characteristics which usually go with heavy egg 

 production, regardless of breed. It is, as well, a 

 means of finding the utility value of one bird 

 over another. 



Secure a number • of specimens which are 

 known to be good egg-layers and a few which are 

 not, and apply the scale of points on page 108. 



In most cases good layers may be selected by 

 observing the points outlined above. The trap 

 nest, however, is the only sure way unless each hen 

 tested can be kept with a flock of another breed 

 laying eggs of different color. 



EXERCISE XXXVI 



Systems of Heating Brooder Houses and 

 Art of Firing 



Make a study of the heating which is installed 

 at the college brooder plant. Note the kind of 

 system ; whether it is hot water, hot air, or steam. 

 Hot water is most generally used. 



Note the location of the heater. Is it below 

 the level of the pipe runs ? If so, why ? Note 

 its shape, size of fire box, also the water jacket or 

 tubes. Determine whether it is put together in 

 sections by means of collars, or nipples, or is the 

 body made in one piece. With small circular 

 heaters the latter is usually the case. Note the 



