OUTBREAKS WHICH CAME UNDER DIRECT 
OBSERVATION. 
JOHNSON OUTBREAK, 
Dr. Wilson and the writer went to North Branch, Chisa- 
go County, October 30th, for the purpose of investigating a 
very virulent disease that had appeared in acertain herd. 
The previous history was rather unsatisfactory because in- 
definite and incomplete. It was learned that five calves be- 
longing to another party had died in acertain pasture ear- 
lier in the season, probably in June or July. The history of 
these cases agreed with the recent cases which we went to 
investigate, in that the calves had died suddenly; there had 
been some slight local, diffused swellings and on skinning, 
dark red areas were noticed: by the owner. Another neigh- 
bor had lost suddenly acow some months before with symp- 
toms and history that agreed closely with those of the pres- 
ent outbreak and the five calves previously mentioned. 
Mr. Johnson reported that he had 20 cattle in his herd 
when the disease first appeared on September 15. A portion 
of the pasture was dry; another portion quite low and wet, 
but without timber. None of the cattle had had access to 
standing corn stalks. He had lost two animals about No- 
vember 1, 1899, from what he supposed was the same dis- 
ease. These were calves about six months of age. The 
owner noticed that in these previous cases the manure was 
coated with blood or showed bloody streaks. During 1900 
one was taken sick and died suddenly in July, another about 
the middle of October. He had lost also one roan steer calf, 
seven months old, which died sometimeearly Monday morn- 
ing, October 29th, and ared heifer calf about the same age, 
which died on the same Monday. Bothdeaths occurred sud- 
denly. The former was noticed to limp some in walking, 
the trouble being apparently in the left front limb. These 
two calves were examined post-mortem by Dr. Wilson and 
the writer on Wednesday, October 31st. 
The following parts were examined and all parts were 
