W. L. Braddon 269 
(c) When present as short forms they change position freely within 
the corpuscles. 
3. When attached to the exterior of the corpuscle by one end only, 
the filamentous forms sway freely in the plasma and also vibrate in 
a limited range to and fro. 
4. When wholly free in the plasma the filamentous and slender 
lanceolate forms move slowly and irregularly through and about the 
field, exhibiting movements of rotation, and of bending or unbending. 
Relation to the disease. 
The bodies have been invariably found by the writer in all ca.ses 
of typical acute rinderpest, during the febrile stages, and in the great 
majority of cases for long periods, up to eight months, after recovery 
has taken place, a fact of which the significance vvill be discussed later. 
In artificially inoculated animals (proved first to be free from these 
forms) they appear as early as the third day after infection—slender forms 
equal to the radius of a corpuscle being by then often present in great 
abundance. From this date onwards they increase rapidly in both 
number and in size, until ultimately, even in serum-protected animals, 
three-quarters of all the discs may be occupied. 
The earliest appearances after inoculation are minute dots,^aud 
slender comma or short-curve forms. In natural infections, especially of 
the buffalo (which is unusually sensitive to the disease), every corpuscle 
may be infested with many of the bodies. Their appearance precedes 
by several days the onset of pyrexia and thus forms a valuable means of 
discrimination of contacts. 
This was the case for instance in the beast from which the specimen 
was taken which is illustrated in PI. XIX, figs. 63-71. All those nine 
corpuscles were adjacent discs in the same field. The animal appeared 
on that date perfectly well, but three days after was dead, of the acutest, 
“ algid ” type of attack. 
In animals less susceptible than buffaloes, such as cross-bred Indian 
and Siamese cattle, the bodies appear always both less pronounced in 
size, less active in movement, and less numerous. In the successive 
reactions following injections of virus in immunised animals, even in 
buffaloes, there is the same progressive diminution in size and numberf 
^ Ultimately, whether after natural recovery or at the end of the immunising process, 
the earlier shapes give place to short thick and stumpy or rounded forms which resemble 
mere accretions of haemoglobin and stain, only they are seen entirely within a perhaps 
unaltered corpuscle. (See Plate XIX, figs. Ill, 112.) 
