GENERAL PATHOLOGY OF “SURRA” IN ANIMALS. 
589 
These were of two forms: a smaller, with very active move 
merits of the flagella, and a larger, with much slower move¬ 
ments. In specimens stained with methyl blue, Professor 
Klebs observed that the monads were sometimes on the edge 
of the red blood corpuscles', and sometimes inside them. They 
are said to resemble the hasmatozoa of pernicious anaemia, and 
the plasmodia found by Laveran in the blood of patients suf¬ 
fering frommalaria. ( Wiener Med. Zeitung, Feb. 4th, 1890.) 
I have in the first edition oi my work on Equine ’Diseases 
of India, 1887, and elsewhere, shown that similar monads may 
be found in intermittent and remittent fever of the horse in 
India. And Dr. Ranking has recently claimed an identity be¬ 
tween the organisms of surra and those found in intermittent 
fever (ague) of the human subject ( Veterinary Journal , June, 
1891). Klebs acknowledges that in those cases in which he 
observed flagellate protozoa in the blood in very large num¬ 
bers there was a repeated occurrence of febrile states, gener¬ 
ally in the form of intermissions ( Ceutralb. f. Bact. u. Parasit ., 
No. 5, vii, 1890). The existence of protozoa in the blood in 
malarial or intermittent fever is undoubted, and Dr. Klebs 
assumes that in those cases in which he noted the presence of 
monads (. Rhizomastignia of Butschli) there was a repeated oc¬ 
currence of febrile states, generally in the form of intermission. 
{Brit. Med. Journ., Feb. 15th, 1890). 
The differences of opinion of various investigators as to 
the morphology of the parasite witnessed in surra are clearly 
accounted for in McCurdy’s description of the organism pe¬ 
culiar to Texas fever, which 1 believe to be an analogous dis¬ 
ease. Mr. McCurdy says, — “ The germ oi this disease 
may be said to be of the bacillar species and the facultative 
type, assuming various forms during life. The ovoid forms 
are the ones particularly noticed, but it appears that this is 
only a transition stage which finally terminates in the more 
mature form. If cultures are prepared from material con¬ 
taining the ovoid forms, they elongate, become surrounded 
by a gelatinous areola, and break off into two short rods or 
double and single bodies. The spherical ovoid forms and short 
rods are found both in the liver and fluids in zooglea. At the 
