Figure 16. Macroscopic Tube Agglutination Test. 

 Ttie tube on the left shows a negative reaction, and the tube on the right a positive reaction. 

 Refer to question 38. 



Figure 17. The Rapid Serum Agglutination Test. 

 The mixtures'in the squares on the left show a negative reaction, and the mixtures in the squares 

 on the right a pibsitive reaction. Refer to question 39. 



(18) 



