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THE PRECIPITIN TEST FOR BLOOD. 



B, paper in which A was wrapped ; C, small knife ; D, brass 

 rings ; E, Kaffir sporran ; F, blanket ; G, cloth ; H, old blanket ; 

 J. new blanket ; K, leg rings. 



To each of these articles a threefold test was applied: (i) 

 Ordinary chemical tests, which would indicate whether any- 

 particular stain was blood at all or not ; (2) microscopic examina- 

 tion, to show whether, if blood, it was mammalian or otherwise ; 

 (3) precipitin, to reveal, if mammalian blood, whether it was 

 human or not. In the following summary, indicating the results 

 of the tests, the several stains on each article examined are 

 denoted by appended numbers : : — 



It was therefore concluded that the only article stained 

 with human blood was the small clasp knife C. 



The human anti-serum in this case was prepared by intra- 

 peritoneal injection with hydrocele fluid, and was duly tested 

 with other mammalian bloods before being applied to the above 

 stains. 



During 191 1 and the current year in no less than six other 

 cases has this test been most successfully applied, and it is my 

 firm opinion that by taking due precautions and arranging proper 



