THE MICROSCOPE IN MEDICINE AND SANITATION. 115 



The presence in the blood of free "pigment," probably 

 stainable material from decomposed blood- cells or para- 

 sites, is characteristic of malaria. 



Fig. 45. — ^The Malarial Parasite (Stained). (After Slater and 

 Spitta.) 1000 diameters. 



6. The Examination of Sputum for Tubercle Bacilli, 

 and the Cultural Diagnosis of Diphtheria. — Besides the 



