LETTER OF TRANSMITTAL. 
U.S. DEPARTMENT OF AGRICULTURE, 
BurEAU OF ENTOMOLOGY, 
Washington, D. C., June 19, 1907. 
Srr: I have the honor to transmit herewith a manuscript prepared 
by Messrs. W. D. Hunter and W. A. Hooker of this Bureau. The 
manuscript is a study of the life history and habits of the North Amer- 
ican fever tick, together with notes on other species. The work upon 
which this bulletin is based was begun in July, 1905, after practically 
all of the directors of the southern experiment stations had brought 
to the attention of this Bureau the necessity of additional work on 
the important parasite which transmits Texas or splenetic fever of 
cattle. Prof. H. A. Morgan, director of the Tennessee Experiment 
Station, has given valuable advice during the progress of the work. 
The paper contains information of great value in the practical work 
of tick eradication. I therefore recommend that it be issued as 
Bulletin No. 72 of this Bureau. 
Respectfully, C. L. Maruatr, 
Acting Chief of Bureau. 
Hon. JAMES WILSON, 
Secretary of Agriculture. - 
