PLEUROPNEUMONIA. 
817 
together in the body of the parent, were, in their plastic 
state, thus brought together at the most favorable moment 
or impregnation, i. e. for the blending of the two elements. 
While the active amoeboid bodies without cilium might have 
been the product after impregnation, thus prepared for inde- 
pendent existence when the parent might choose to throw 
them off, or might become effete, and thus by dissolution 
allow them to escape into the water. 
“ 1 have much more that I could state to you on the sub- 
ject, but neither my leisure nor your patience, I fear, admits 
of the extension. Sufficient, however, has been written to 
show you the amount of interest I still take in these matters, 
and thus prove to you how acceptable was the copy of your 
paper. “ I am, my dear Sir, 
“ Yours very truly, 
“Henry Carter/’ 
Journal of the Royal Microscopical Society. 
OBSERVATIONS ON THE LUNG DISEASE OF CATTLE KNOWN 
AS PLEUROPNEUMONIA, WITH ESPECIAL REEERENCE 
TO THE MEANS OE PREVENTION. 
By Processor Brown, Inspector in the Veterinary Department of the 
Privy Council, and Veterinary Inspector to the Bath and West of 
England Society and Southern Counties Association. 
Early History of Pleuropneumonia. Introduction of the Disease 
into the United Kingdom . 
Accounts of the prevalent diseases of the lower animals, 
by the older writers, are commonly so vague and general in 
their character that the modern investigator finds but little 
difficulty in applying the descriptions to various epizootics 
which are known at the present time. Murrain, distemper, 
and plague, are terms which have no very restricted meaning, 
and they have been applied by different writers to totally 
dissimilar diseases ; it is only occasionally, when a disease 
has some special feature, such as the eruption of sheep-pox, 
that the historian’s account can be certainly identified in its 
essential details with a malady of a later date. 
In reference to lung disease of cattle we are left in doubt 
as to the precise period of its detection, or the place of its 
origin ; most of the epizootics which have from time to time 
destroyed cattle and sheep, have been marked by disease 
more or less well-defined of the respiratory organs, and it is, 
therefore, easy to imagine that the description of symptoms 
of a fatal affection, which attacked herds of a former period, 
