reliable, and many of them should be classed with 

 toys. For instance, we have two of the same make 

 and kind, and placed them side by side, and found 

 them indicating different degrees of humidity. 

 We have then placed a high-priced hygrometer 

 between them and corrected both to correspond 

 with the high-grade instrument. In a few hours 

 No. i would mark 70 while No. 2 would point to 

 90 while the standard instrument indicated 55. 

 Again, when No. i was at 90 No. 2 was pushing 

 past 100, and later when No.. 2. was at 40 No. i 

 was at 55. There was no regularity or .method 

 in their variations, as one would be higher than 

 the other one day and lower than the same the 

 next day. Of what use would either of those 

 instruments be in an incubator even if you could 

 control the moisture ? The old-fashioned way of 

 putting a cigar in the incubator would be just as 

 serviceable. You tell by the feel of the cigar about 

 how moist or dry the air is. 



There are, of course, hygrometers that are cor- 

 rect, but few of them are adapted for use in an 

 incubator. Some are too long or high for the 

 space between the egg tray and the heat radiator, 

 while others have a scale so small that it cannot be 

 read without removing it from the egg chamber to 

 a stronger light. 



It is well to have a good hygrometer in the incu- 

 bator room and to keep a record of its readings, 

 daily, for it will be a valuable guide, taken in con- 

 nection with the record of kinds and condition of 

 eggs in the incubator, in determining when to fill 

 118 



