TS OBSERVED AT COLORADO SPRINGS.

"_Skin._--'Its activity is increased; it is also better nourished and
strengthened.' These effects are very markedly shown, the ruddy
appearance of residents indicates at once the activity of the
circulation, and the quickness with which the nerves of the skin
respond to the impression of cold and heat; whereby, as has been
shown, nature protects the body against cold-catching, and indicates
its increased activity. These physiological effects are best
demonstrated by a consideration of the influence of the climate upon
the skin where there is some disorder or disease of it, or of some
organ or function upon which it depends. As regards the skin itself,
it is a common saying that Colorado is bad for good complexions and
good for bad ones. This means that the beautiful pink and white
complexion, that is so much admired, is destroyed, the burning of the
sun and the vigour imparted to the circulation make fair maidens
'ruddier than the cherry and browner than the berry.' While the
complexions of those who are sallow and marked with acne, are
improved; the sluggishness and poverty of the skin is stimulated, the
colour gets brighter and the glands acting freely again the pores
cease to be clogged with the hardened secretion, and by these means
the acne is removed.

"_Circulation._--'Heart and blood-vessels are probably strengthened.'
The frequency of the pulse is certainly increased in individuals upon
first arriving in Colorado, being greatest in those most feeble. In
well persons and those who regain their health, it also soon returns
to its customary number of beats. That each separate beat is made
stronger is probable, but hard to demonstrate; however the fact will
be admitted by all physicians practising in Colorado, that hearts
which are muscularly weak, even when there are bruits, greatly
improve in tone, strength and steadiness; while those where from some
disease or obstruction the muscle is increased in size and strength,
the symptoms are almost always so alarmingly developed that they have
to be sent away before there is time to observe what the secondary
effects might be.

"_Lungs' Respiration._--'The number of respirations is increased at
the beginning of the stay, but returns to the normal number after a
longer time, and probably the depth of the inspiration is also
increased.' This is in accordance with our observations. The greater
expansion of the chest, and the frequency