Ml THE SPEECH OF MONKEYS, 



selves are an aggregation of smaller vibrations. 

 I have not as yet been able to compare the notes 

 one by one with the scale of the xylophone in 

 order to ascertain whether or not they obey the 

 laws of sound upon which is founded the chro- 

 matic scale of music. The lion makes only a 

 small number of different sounds, nearly of the 

 same pitch. I have not analyzed the vocal 

 sounds of the other felines to ascertain to what 

 extent they coincide with those of the lion, but 

 his appears to be somewhat unlike any other 

 sounds which I have examined. 



Among the few sounds of birds which I have 

 analyzed I may mention the trumpeter crane. 

 I have made one record of this bird, which was 

 sufficiently loud to enable me to obtain some 

 idea of the character of the sound. I am in 

 doubt as to what the real mode of producing this 

 sound is. The volume of sound evidently comes 

 from the mouth of the bird, but while in the 

 act of making it he appears to bring the whole 

 body into use ; even the feathers appear to take 

 some part in its production, and the whole frame 

 of the bird vibrates in the act. The record 

 which I have shows some resemblance, on analy- 

 sis, to the sound made by the lion, but it is not 



