ERADICATION OF THE ROCKY MOUNTAIN SPOTTED FEVER TICK. 7 
2 females were ticks put on the day before. The male was attached 
before. Two females, 1 on the head and 1 on the back, were barely 
alive. On June 25, 2 dead females were picked from the wool on 
the head. They had never attached. One dead female was picked 
from the wool on the back. This tick was spoken of as barely alive. 
There were 3 females attached in long wool, 1 of which was en- 
gorged a little. 
The following notes show the progress of the experiment: 
June 27, a. m. : The 3 females are engorging to some extent, A male is un- 
der the largest of the three. 
June 28: One of females on the head, which had begun to engorge, is now 
dead. This female was probably killed by the host. There are 3 females at- 
tached and feeding on the head. The largest is one-twentieth engorged. 
June 29, a. m. : One dead male was taken from the neck and a dead female 
from the shoulder. The female had been attached. The one-twentieth engorged 
female is now missing. 
June 30, a. m. : Two males and 2 females are attached on the head. Both 
females are feeding. 
June 30, m. : One female, collected by dragging, was put on head. 
July 1, a. m. : One female was picked from shoulder, which had never at- 
tached. The 2 males and 2 females are still attached as before. One female, 
collected by dragging, was put on the head. This female attached near one of 
the other females. 
July 2 : The female put on yesterday is attached as well as the other females. 
Two females are now one-twelfth engorged. The two males are attached as 
before. 
July 3, a. m. : Three females and 2 males are now attached. The female put 
on sheep July 1 has moved one-half inch from its former place. Two females 
are about one-tenth engorged. 
July 3, p. m. : One of the females that had become one-tenth full is now miss- 
ing. The other is one-seventh engorged. Only 1 male was noticed attached. 
July 5, a. m. : The female that was spoken of as one-seventh full is now full 
or nearly so and has a male beneath. This is the first time that a male has been 
seen near this female. The engorged female was picked. 
July 6 : One dead unfed female was picked from back. One male and 1 
female are now attached. 
July 7, a. m. : The male that was seen under the engorged female is now dead. 
It is crushed as though by the host. The female put on July 1 is now one- 
fifteenth engorged. 
July 7, p. m. : A thorough examination was made at this time. Two dead 
females (unfed) and a dead male were picked from the back and sides of the 
sheep. The attached female is one-twelfth full. 
July 8 : The attached female is about one-sixth full. No males are near. 
July 9 : The attached female is about one-fifth full. No males are near. 
July 10 : The attached female is about one-fourth full. No males are near. 
July 11 : The attached female is about one-fourth full. No males are near. 
July 12 : The female is not attached, but is loose in the wool near its former 
place of attachment. It has begun to shrivel. 
July 13: The female is dead in the wool at same place. It is shriveled and 
discolored. 
