The Destruction of Tetanus Antitoxin by Chemical Agents.
نویسندگان
چکیده
It is only to be regretted that this step was not taken earlier, for the large number of idle bulls now in the herd is both a detriment to that body and a positive loss of once good skins. This menace in the growth of the herd has been repeatedly pointed out (Clark, 1914, 1916, 1917; Osgood, Preble, and Parker, 1915) to those having the matter in charge. The last column in table 1 contains the estimated annual totals for the herd. These numbers are highly artificial in that they are largely made up of computed elements and they are, therefore, so remote from direct observation that their detailed consideration is scarcely worth while. The fact that all elements of the herd have separately increased between 1912 and 1917 is reflected in the increase of these calculated totals from 215,738 in 1912 to 468,692 in 1917. In conclusion it may be stated that since 1912 the steady increase in the numbers of pups born, and of harem bulls and the decrease since 1913 of the average harem are most favorable signs in the growth of the herd. The one unfavorable feature during this period is the considerable increase in idle bulls in 1915, 1916, and especially in 1917. This increase, which can be eventually checked, shows that active commercial killing should have been restored some years ago.
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ورودعنوان ژورنال:
- Proceedings of the National Academy of Sciences of the United States of America
دوره 4 6 شماره
صفحات -
تاریخ انتشار 2005