Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever Page: 156
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156 TEXAS OR SOUTHERN CATTLE FEVER.
PLATE VIII. Amwboid changes of the microiirganism of Texas fever.
Fig. 1. Fresh preparation of blood from No. 69, five hours post-mortem. Prep-
aration sealed with paraffin and kept in a warm chamber with microscope
at 35-40 C. Showing changes of form in an intraglobular parasite.
Nos. 1 to 6, changes going on as fast as could be sketched.
Nos. 7 to 15, sketched twenty minutes later.
Fig. 2. An intraglobular parasite in subcutaneous 1)loodl of No. 95 a few hours
before death, showing changes of outline.
Fig. 3. Another parasite from the same source, showing similar changes.
Fig. 4. Parasites showing a nuclear (?) body from the same source.
Fig. 5. Similar parasites sketched from the fresh cutaneous blood of No. 90,
shortly before death. Note the different forms and relative positions occu-
pied by the intraglobular parasites as well as the presence of the nuclear (?)
body.
PLATE IX. Modified or embryonic red corpuscles after severe hemorrhage and after
Texas fever.
Fig. 1. Blood from sheep No. 160, upon which venesection had been practiced.
Prepared July 7, 1890, after the number of red corpuscles had been reduced
from 11 to 51 millions. Dried and stained as described for Fig. 1 on Plate Iv.
Note variation in the size of the normal corpuscles and the presence of large
corpuscles containing a large number of stained particles or granules of
variable size. (x 1,000.)
Fig. 2. Another field from the same preparation, showing also a tinted form
without granules. (x 1,000.)
Fig. 3. Cutaneous blood from cow No. 168, drawn August 12, 1891, after the red
corpuscles had been reduced by venesection from 61 to 2 millions. Stained
as indicated in Fig. 1. Note the presence of large and small granules in
the corpuscles; also a uniformly stained corpuscle. (x 1,000.)
Fig. 4. From another field of the same preparation, showing two large corpuscles
containing stained granules. (x 1,000.)
Fig. 5. Cutaneous blood from No. 160 (case of Texas fever), Preparation made
November 12, 1891. A corpuscle on the left contains a Texas-fever parasite.
(X 1,000.)
Fig. 6. Another field of the same preparation, showing uniformly stained as well
as granular red corpuscles. Note also the great variation in size of the cor-
puscles having a normal appearance. (X 1,000.)
PLATE X. The cattle tick-the carrier of Texas fever.
(Figs. 1, 3, 4, and 5 were drawn under the direction of Dr. Curtice. Nos. 4 and
5 were slightly modified before insertion.)
Fig. 1. A series of ticks from the smallest, just hatched from the egg to the ma-
tured female ready to lay eggs.
Fig. 2. Eggs magnified 5 diameters.
Fig. 3. The young tick just hatched (x 40).
Fig. 4. The sexually mature male after the last moult. Dorsal view. (X 10.)
Fig. 5. The sexually mature female after the last moult. Dorsal view. (X 10.)
Fig. 6. A portion of the skin of the udder of No. 140. (Ticks artificially hatched
and put on when small.)
Fig. 7. A portion of the ear of the same animal, showing adults ready to drop
off and lay their eggs.
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Smith, Theobold & Kilborne, Fred Lucius. Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever, book, 1893; Washington D.C.. (https://texashistory.unt.edu/ark:/67531/metapth143538/m1/156/?q=%221863%22: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting University of Texas Health Science Center Libraries.