EXPLANATION OF DIAGKAM II. 
A, B, and K are dairy farms selling their product to retail milk 
dealer H. K is the farm on which a case of scarlet fever occurred 
antedating the outbreak in Xorwalk. 
The large square T O AY X represents the city of Xorwalk. 
H is the retail milk dealer among whose customers all cases but two 
occurred. The dash lines represent II's milk route, and each dot is a 
case of scarlet fever. 
C, D, E. F. G, I. and J are other dairymen having routes in Xor- 
walk. The lines extending from them into the city represent their 
milk routes and are introduced to show their freedom from the 
disease. 
