To this there are 197 replies, as follows:

Eighty-two from rivers. Of these 15 have possible contamination, 13 have possible contamination from surface drainage, 2 have possible contamination from slaughter houses, 1 has possible contamination from hog pens and garbage, 2 have possible contamination from manure piles, 1 has possible contamination from vaults and stock yards, 1 has possible contamination from dead animals, 2 have possible contamination from sewage, 5 have little possibility of contamination, and 16 have no possible contamination. In 73 no changes are considered advisable, and in 5 changes are desired.

Eighty-two from lakes. Of these 13 have possible contamination, 5 have probably no contamination, 6 have possible contamination from surface drainage, 1 has possible contamination from sewage, 1 has possible contamination from dead animals, 8 have slight possible contamination, and 21 have no possible contamination. In 71 no changes are considered advisable, and in 10 changes are desired.

Four from creeks. Of these 2 have possible contamination, and 1 from surface drainage. No changes desired.

Twelve from ponds. Of these 2 have possible contamination, 2 have possible contamination from surface drainage, 1 has possible contamination from dumpings, 3 have slight possibility of contamination, and 3 have no possible contamination. In 11 no changes are considered advisable.

Seventeen from rivers and lakes. Of these 5 have possible contamination, 1 has no possible contamination, 1 has sewage contamination, 11 have contamination from dumped garbage, and 1 has contamination from dead hogs. In 15 no changes are considered advisable, and in 2 changes are desired.

CHARTS

SHOWING MONTHLY MORTALITIES-AVERAGE OF ELEVEN YEARS, 1887-1897, INCLUSIVE.

CHART NO. I.-DIPHTHERIA.

AVERAGE MONTHLY MORTALITIES FOR ELEVEN YEARS-1887-1897, INCLUSIVE.