Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever Page: 38
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38
TEXAS OR SOUTHERN CATTLE FEVER.
The number of red corpuscles in cattle (obtained from the counties
around the District of Columbia) during health fluctuates more or less,
as might be expected, but may be put down as six millions in a cubic
millimeter. Seven millions in winter, and five millions in late summer
and early autumn seems to be not uncommon. The number may be
said to fluctuate, however, between four and one-half and 'eight mil-
lions, since these extremes are occasionally met with. The following
counts from healthy animals will serve as illustrations:
No. 109. No. 91.
Placed in
September 18, 1890 ........... 5, 726, 000 October 1, 1890... 4, 672, 000 infected
October 3, 1890 ............... 6,190, 000 field.
October 14, 1890.....---......-----... 5, 807, 000 October 7, 1890... 4, 833, 000
October 30, 1890.. -4, 670, 000
No. 143 (control animal).
September 29, 1890..-.........-------.......---.----.----.---- ------..............----.......--------...-. 6,261,900
October 8, 1890 .....----.........------.--.........-------..----..--------------------... -----6, 835, 000
October 25, 1890 .-.....---..-------....---.- -----------------------..------...... 6,500, 000
In addition to these illustrations there may be found in the appendix
a large number of figures relating to the number of red blood corpus-
cles of cattle in infected fields, but not yet diseased. The examination
of the blood in 1891 was extended to many, and in 1892 to all, animals
at the beginning of experiments, in order to get at the approximate
normal for each animal, and also to make sure that the animals were
in good health. Among the many cases which came under observation
only one anaemic cow was found; that is, only one whose red corpuscles
fell below four and a half millions. This animal (No. 136) was affected
with some catarrhal discharge from the vagina. Her record was:
September 30, 1890 --............-----.-----.....-----..--------......-------....... 3, 911, 300
October 8, 1890 ---..- -......--.- ---..------------ ------... --------........ 3, 753, 800
October 18, 1890 . -.--------------- - ------------......--------- 3,735, 300
Second row:
8 14 7 13
11 9 10 8
15 13 13 13
8 8 15 17
12 13 9 14
54+57+54+65=230
463
Seven white corpuscles in 400 squares.
7 x 100 x 4000 x 10
400 X 7.3 -9,589 white corpuscles.
In counting 40 squares the various factors in the fraction above balance each other
in such a manner that it is only necessary to divide the number of corpuscles (463) by
the quantity of blood collected (7.3 divisions of melangeur instead of 10, the quantity
usually collected). The first figure of the quotient gives millions. A similarsimpli-
fication of the formula for the white corpuscles may be used.
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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/m1/38/?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.