LETTER FROM WEST CHESTER, PA. A2 
and comfortably. We have seen, that so far as conditions of sunshine, humidity, 
and rain- and snow-fall are concerned, the invalid can lead an out-of-door life a 
greater percentage of the time in Colorado than anywhere else in this country; 
and we claim that he will never find these factors counterbalanced by the element 
of temperature. An experience of several years warrants the writer in asserting 
that an invalid can, with perfect comfort and safety, spend several hours in the 
saddle nearly every day of the three hundred and sixty-five. One has but to 
read ' H. H.'s' writings to learn how attractive out-of-door life is in Colorado, 
even in mid-winter; and we can positively assert that we have known of picnics 
being held day after day, in the open air, in the very heart of the winter, and 
that there are days and weeks in mid-winter when one can sit with doors and 
windows open. 
In conclusion, the writer would state, that while his personal experience in 
regard to a desirable climate for the cure of phthisis has been such as to convince 
him of the great superiority of the climate of the Rocky Mountains over any 
other in this country, yet in this article he has tried to put aside any personal 
bias, and he desires to carry conviction only in so far as he has been able to 
adduce facts, and to interpret them rationally and logically. He would state, 
further, that, if the reader should take exception to any interpretation given to 
the facts, the tables still stand as the best and most reUable data of these facts 
attainable, and they are not to be controverted. —Science. 
CORRESPONDENCE, 
LETTER FROM WEST CHESTER, PA. 
West Chester, Pa., October, 1883. 
Editor JIeview : — Of the numerous scientific papers received, none is 
more welcome than your Kansas City Review, from the far west. Coming 
from a section from which we have not been looking for enlightened information, 
we are surprised to find it so rich in interesting original matter, and so well sus- 
tained by local talent. 
Perhaps I appreciate it the more highly because of its treating of subjects in 
which I have long been deeply interested. 
For a few years past I have been engaged in collecting relics of the stone 
age in this section of Pennsylvania (the southeastern corner), and novy presume 
that I have one of the best collections in it. Thinking that a few remarks upon 
these remains of the aborigines might interest you I take the liberty of sending 
you the results of so i e of my observations. 
In the first place we have no mounds here, or known evidence of the mound- 
