regulator the expansive power of which was, 

 we believe, rubber. Now they say it is worthless. 

 Then they declared that they added only such 

 features as had ' ' proven practical? ') A regulating 

 device which depends on a rubber bar for its power 

 will not last, as the rubber, when continually 

 exposed to a temperature of 103, dies, as the 

 scientists say, or loses its power of regular expan- 

 sion and contraction. It is like the rubber in a 

 pair of ordinary suspenders, in the heat of summer 

 the rubber gives out. A steel strip is used with a 

 view to correcting this loss of power in the rubber 

 thermostat, but with only temporary results. 

 ( Was this true when they claimed it "proven" 

 " complete in every particular and as sensitive to 

 the heat' s action as the thermometer itself" ; or do 

 the laws of nature change within a year to suit the 

 convenience of these punsters ? Verily, the farce is 

 a merry one!) We know exactly what we are 

 talking about in this respect, for the simple reason 

 that we once adopted this same device and had to 

 discard it as being worse than no regulator at all. 

 {But say, while we are proud to see them own up 

 for once, we cant exactly see how they are going to 

 explain the fairy tale in one of the catalogues No. 

 6, where they declare that they added only such new 

 features as have PRO V EN practical and consist- 

 ent, and give the public to understand that the said 

 device had been thoroughly tested and proven, and 

 found practical and accurate. 



There are no secrets connected with the 



incubators, none whatever. In this book we aim 

 no 



