TYPHOID-FEVER POISON. 



515 



sweep the summit. The slope of the hill east of the infected locality is 

 of much lighter grade than that of the western ridges, and is thickly 

 built up with small frame houses, except that about one hundred yards 

 south of the group of houses, shown in the cut, the slope of the ridge 

 is covered to the extent of twelve acres by the city cemetery, filled by 



Explanation. — a, S, c, d, e, /, f/, h, i, k, houses ; L and C, streets ; w, w, sewer and house 

 flrains ; p, privies ; ,«, f, u, v, wells. The Arabic numeral? attached to the houses indicate the 

 number of cases of fever in each. The Roman numerals indicate the order in whicli each house 

 was invaded by the fever, n, sewer opening in the street gutter, if, uninfected houses. 



eight thousand interments, and still used as a burying-ground. Tliis 

 second valley differs from the other in being gradually narrowed in its 

 northern extension, so that the streets i and C gradually approach 

 and enter each other at an acute angle about one hundred yards north 

 of the scene of the infection. The little group of houses shown in the 

 map are isolated by vacant lots to the north and south. The houses 

 were one story frame, gable ends faced to the street, neat and comfort- 

 able, and were, with one or two exceptions, little freeholds, occupied 

 by their owners, tidy and industrious Germans, except that the houses 

 f and g were occupied, one by English and the other by Irish-American 

 families. The houses were built two upon each city lot of sixty -six 

 feet front by one hundred and twenty feet deep, and separated fi'om 

 each other by light picket and board fences. Several of the owners 

 turned their ground to account by growing vegetables. At an average 

 distance of twenty feet to the rear of each house were the usual privy- 

 vaults, all of them too shallow and badly cared for. The water-supply 



