I4S 



PRACTICAL PHYSIOLOGY. 



[XXIV. 



{a.) Donne's Test. — Filter off the fluid, and add to the deposit a small 

 piece of caustic jiotash, or a few drops of strong solution of caustic potash ; 

 the deposit becomes ropy and gelatinous, and cannot be dropped from one 

 vessel into another — due to the formation of alkali-albumin ; the deposit is 

 pus. Tlie same reagent with mucus causes the deposit to become more fluid 

 and limpid, to clear up, and look like unboiled white of egg. 



Fig. 7S. 



-Hand Centrifage made by Muencke, Luisen Strasse, 58, Berlin, N.W. 

 Cost, ;^3, 10/. 



{h.) With the microscope numerous pus-corpuscles are seen, which, when 

 acted on by acetic acid, show a bi- or tri-partite nucleus. This test is not 

 absolutely conclusive. 



(f.) Urine containing pus gives the reactions for albumin, while, if mucus 

 alone be present, it gives only those for mucin. 



