302 
THE HERTER LECTURES. 
IIV. PIROPLASMOSIS. 
By GEORGE H. F. NUTTALL, M.D., Ph.D., Sc.D., F.R.S. 
Formerly Associate in Hygiene, Johns Hopkins University; 
Fellow of Magdalene College, Quick Professor of Biology 
in the University of Cambridge. 
(With 14 Text-figures.) 
The diseases included under the general term of piroplasmosis are 
amongst the most devastating which affect domesticated animals, and 
they are, consequently, of great economic importance. As far as known, 
all forms of piroplasmosis ai e tick-transmitted. 
Diseases -due to Piroplasrna ( = Babesia). 
Strictly interpreted, the term “ piroplasmosis ” applies to diseases 
caused by intracorpuscular parasites belonging to the genus Piroplasrna 
( = BabesuP) which possess certain definite characters, produce definite 
symptoms, and are communicable by blood inoculation. 
The striking features which characterise Piroplasrna are the 
following : on examining the infected blood corpuscles and enumerat¬ 
ing them in accordance with the types of parasites they contain, it will 
1 Owing to the lecture not having been written until after it was delivered in the 
Medical Department of the Johns Hopkins University, 10 October, 1913, the author has 
taken the opportunity of adding a considerable amount of new matter and has somewhat 
altered the original form of the lecture. 30. vi. ’13. G. H. F. N. 
Figs. 1, 3, 4, 9, 10 and 14 are reprinted from Parasitology, vols. i.-v.; the remaining 
8 figures (2, 5-8, 11-13) have not hitherto been published. All except Fig. 9 are by the 
author. 
^ The generic name Babesia has priority, and is coming into general use, although the 
name Piroplasrna is more usually employed by American and British writers. 
