EXPLANATION OF DIAGRAM I. 
The large square M N O P represents the town of Stamford. 
B is the dairy distributing the implicated milk, and the dash lines 
running from B into the city represent the milk route of this dairy. 
Each of the dots represents one case of typhoid fever and is placed 
upon the route of the dairy from which it was supplied with milk. 
There are 368 such cases on B’s route, including the 12 around the 
[~S] , which is meant to represent the cafe supplied by B. B supplied 
about one-eleventh of the milk used in the town. 
H H and H are distributing dairies similar to B. 
C H and E B L are producing farms selling milk to B and also 
peddling some themselves. The dash line extending from E B L 
represents his personal route of 5 houses in which 8 cases of typhoid 
occurred. 
J H B and JBH are producing farms selling milk to B and also 
to distributing dairies H and H H. 
The double lines show the dairy to which the producer sold most 
of his milk. 
Dash lines show the apparent course of the infective agent. 
C, D, E, F, and G are other dairies having routes in Stamford. 
