said to possess another sense agreeing 
with our own solely in the medium by 
which it is excited." 
The human ear is capable of hear- 
ing musical sounds produced by vibra- 
tions ranging from twenty-four in a 
second of time to forty thousand. 
This indicates that humanity is con- 
fined in interest to the motions of the 
atmosphere within these limits. The 
possibilities of higher and lower fields 
of music are such that one writer has 
said that it may be that the air about 
us is constantly resounding to the 
music of the heavenly hosts while our 
dull ears with their limited powers are 
unable to catch the poorest note in 
that celestial harmony. 
Sound travels about one thousand 
ninety feet in a second in the air. 
Through other elastic mediums it 
varies in speed. The beholder of an 
explosion of dynamite in a harbor, 
receives three shocks, one coming by 
way of the air, another by water, and 
the third through the earth, all 
arriving at different times. 
It is a fortunate thing that low 
sounds travel as rapidly as high ones 
and loud sounds no faster than soft 
ones. Thus the playing of a band 
upon the water, at a distance, is beau- 
tiful, because all the tones powerful 
enough to reach the listener do so at 
the right time to preserve harmony. 
If it were not for this equality in 
traveling power, no music on a grand 
scale could be possible, for those sitting 
at a distance from the performers would 
be in a sea of discord from the late 
arrival of tones which should have 
blended with those gone before. In spite 
of the fact that our highest appreciable 
note is but one-third of an inch in 
length of wave and the wave of our 
lowest note exceeds forty feet in length, 
all sounds produced in harmony travel 
in harmony till exhausted in space. 
The ears of various animals are beau- 
tifully adapted to their respective 
habits. The watch of the Dog is most 
valuable because distant noises are so 
readily detected by his faithful ear. 
The Thrush has been observed hop- 
ping along the ground with frequent 
stops to listen. So keen is his hearing 
that the presence of a Worm below the 
surface is detected by the sound of the 
Worm's occupation. By judiciously 
beating the ground he brings the 
Worm toward the surface as if to 
escape its enemy, the Mole. At the 
proper instant the turf is torn up and 
nearly always the Worm secured. 
The form of the outer ear is adapted 
to the needs of the animal. Most 
grass eating animals have ears that 
turn readily in all directions to listen 
for enemies, but the ears of flesh eating 
animals that pursue their prey are set 
only to reach forward to hear the 
sounds of escaping prey. 
Many insects and lower orders of 
animals are looked upon by man as 
incapable of the pleasures of hearing. 
But this is often a mistake. Snails 
have been known to enjoy the voice of 
their human friends and come forth 
when called by familiar voices. 
The fondness of the Cobra for music 
and the powers of charming this 
hideous animal partly by appealing to 
his esthetic hearing are well known. 
Moths have good hearing as one may 
observe while walking in the woods 
where the crackling of dry sticks 
alarms them so they fly up from their 
noonday slumbers in great numbers. 
The antennae of the Butterfly are 
supposed to act as hearing organs. 
Crabs and Shrimps hear with their 
inner antennae, Clams with their feet, 
and some of the Crustacea with the 
bases of the lobe of the tail. 
Many animals seem to enjoy the 
voice of man and the sounds of the 
various musical instruments which he 
uses. Frogs and Toads may be taught 
to know their master's voice. Canaries, 
Parrots, and Doves enjoy human sing- 
ing and instrumental music as well. 
A Woodchuck has been known to 
