HAEMORRHAGIC SEPTICAEMIA. 141 



in the history of the cases, whereas, in haemorrhagic septicaemia 

 the temperature is often normal or sub-normal until near death, 

 and then in some cases rising very rapidly. A pronounced swell- 

 ing of the front or hind quarter is rather characteristic of black 

 leg, although in some cases which die very suddenly there may 

 be no noticeable swelling. These cases usually occur early in the 

 history of the outbreak of black leg, and following them there are 

 other cases which show the characteristic swellings of black leg. 

 Swellings of this kind are not characteristic of haemorrhagic sep- 

 ticaemia, and when present at all are small. 



Blood taken from a black leg tumor is dark, frothy and with 

 disagreeable odor, whereas blood taken from a case of haemor- 

 rhagic septicaemia, even from the small swellings which some- 

 times occur, is apparently normal. It reddens on exposure to air 

 and clots readily. It should be noted that this is also true of 

 blood taken from general circulation in the cases of black leg. 



A diagnosis between these two diseases may, as a rule, be 

 quite easily made by examination postmortem. Here we have 

 in a case of haemorrhagic septicaemia the characteristic haemor- 

 rhages which appear as blood-stained or bruise-like areas under 

 the skin; and sharply defined blood-stained spots on the internal 

 organs or the lining membranes of the chest and abdomen. These 

 haemorrhages are not at all characteristic of black leg. On skin- 

 ning animals affected with black leg, crepitating, gas-rmed tumors 

 of black leg are usually found which are characteristic of that dis- 

 ease. These are not found in haemorrhagic septicaemia. 



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