AA Public Parks. 



west side of Main Street, north of Court, more deaths took place 

 than in any other portion of the city ; and that more occurred in 

 proportion to the number of inmates in every other house, than in 

 the one in front of which were trees ; and what is still more con- 

 vincing, the natural predisposition to cholera existed to a greater 

 extent among the inmates of this house, than in any other. Another 

 and more striking instance occurred in the two houses nearest the 

 " Old Saw Mill." The house adjoining the mill was surrounded by 

 trees and not one of the occupants suffered from cholera ; while, in 

 the other house, which was exposed and stood upon the bank of the 

 Mississippi, three deaths took place ; and what is more to the point is, 

 that the family which escaped, were new-comers and suffering frojn 

 nostalgia and the effects of a change of climate, which act as a 

 predisposing and exciting cause of the disease ; while those who 

 lived in the other house, were old residents, and had been thoroughly 

 acclimated. Dr. Buckler notices similar facts in his account of the 

 cholera as it appeared in the Baltimore Aims-House, in 1S49. 



In the summer of 1852, the trees on the high bluff' in the northern 

 part of Burlington, were cut down. It was not until the months of 

 August, September, and October, of the following year, that any 

 apparent effect of this destruction of the trees took place, when nearly 

 all who lived in that portion of the city suffered with fevers, and 

 several of them died. 



During the late war of the Rebellion, much of the sickness of the 

 army of the Potomac in the summer, autumn, and winter of 1861, 

 while encamped near Washington, was the result of the destruction of 

 the trees for purposes of defence, as a military necessity, and for the 

 use of the troops. The same was also noticed in Louisiana, where 

 troops had been encamped for some time, and many trees were cut 

 down. This was strikingly illustrated at Port Hudson,' where, for 

 purposes of defence, the rebels cut down nearly all the timber 

 adjoining the outer fortification. It became necessary, in several 

 places, to cut down more by our troops, and in a very short time 

 the effect was quite marked in the increase of sickness, exclusive of 

 casualties, in the regiments camped upon or near this ground. 



TREES MODIFY CLIMATE. 



We next propose to consider how far trees modify climate. Their 

 shafts may be i-egarded as so many pipes for conveying heat from 

 the earth to the air in winter, and from the air to the earth in the 



