Occasional Notes. 143 
The change thus produced is a noteworthy and interest- 
ing one : for it seems to be an entire alteration in the 
pigment of the feathers — one brought about by the ab- 
straftion of some essential constituents, such as the com- 
ponent parts of water, or by the re-arrangement of the 
original component parts. It is also noteworthy that the 
change is brought about by the application of heat, the 
great inducing agent in chemical re-arrangements and 
combinations. I hope, in a future number, to be able to 
say something more on the original purple pigment pres- 
ent in these birds and on the red coloration artificially 
produced. 
J- J- Q. 
/^fafifrS 
