structed, their several methods of operation, and 

 the good and bad points of each method, with our 

 reasons for calling them good or bad, as the case 

 may be. Having used nearly all the makes now 

 on the market, and many that have gone out of 

 the market, we should be able to do so very fairly. 

 Then we shall leave you to judge for yourself. 

 This you can do intelligently if you will carefully 

 examine each machine, either by actual sight of it, 

 or by the illustrations which their manufacturers 

 send out to inquirers. 



First look at the machine, or a picture of it, read 

 the description which accompanies it, and be sure 

 that you understand how it works. If the prin- 

 ciples are clear to you, then consider whether or 

 not the application of those principles as shown, 

 will produce the results essential to successful incu- 

 bation if, in your opinion, they will accomplish 

 all that the manufacturer claims for his machine. 



If the construction and principle are correct, the 

 maker can have no good reason for failing to show 

 them plainly to his prospective customers. 



When a manufacturer fails to show and explain 

 the interior work and construction of an incubator, 

 you will be pretty safe in your conclusion that 

 either he has nothing good to show, or he has 

 something bad to conceal. These are enlightened 

 days, and the average man or woman readily 

 understands the artist's lines when accompanied by 

 simple explanations. 



Do not be deceived by handsome appearance, 

 big claims, or miraculous testimonials. Beauty is 

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