44 Effects of artificial temperature, dc. 



I have onl}^ to add that, with the permission of the 

 authorities of the Natural History Museum at South 

 Kensington, my exhibits will be left there for a time, for 

 the more leisurely inspection of all interested in them, 

 and if any desire to examine the long series I have at 

 home, these will be much at their service. 



Note. — To correct misapprehensions it may be as well 

 to state that though, where the temperature conditions 

 are extreme, whether high or low, there is, as might be 

 expected, a tendency to crippling, there is no such 

 tendency whatever under more moderate conditions. In 

 those species in which the effects are most marked, the 

 extreme effects in colouring are produced by small 

 differences of temperature, without causing any crippling 

 or any trace of disease or unhealthy appearance. Kather 

 a large proportion of those subjected to extreme con- 

 ditions was exhibited, as they showed much individual 

 variation, but out of 172 specimens exhibited fully 150 

 are quite uncrippled. 



