26 



bluish line stretching across the corpuscle, yet 

 always shewing somewhere a red nucleus, or a 

 mere streak along the margin of the red cell, with, 

 however, a red nucleus in the blue protoplasm 

 (accole forms). 



Finally, no small structure should be diagnosed 

 as a parasite unless it is clearly made out that it 

 has three distinct parts. 



(i) A red nucleus. 



(ii) Blue protoplasm or body. 

 (iii) A vacuolic area within the ring (in the 

 irregular forms this cannot be distinguished). 



No confusion can then possibly arise with a 

 platelet or stained vacuole or dirt. 



A nucleated red cell has not these characters. 

 Nor, again, has a red cell shewing polychrome or 

 basophil staining, i.e., a purplish or bluish mottling 

 all over. In fact, no other body has the definite, 

 quite easily distinguished characteristics of a 

 parasite. 



2. Large Intra- corpuscular Forms (Fig. 3). — ■ 

 They appear as more or less extensive areas of 

 blue protoplasm, with one or more distinct, red 

 areas. Pigment may be seen scattered over the 

 parasite. These large forms are generally simple 

 tertian or quartan parasites. 



3. Crescent and Crescent -derived Bodies — These 

 are most definite bodies, and readily recognized 

 by the coarse pigment granules centrally situated. 

 The presence of this pigment should absolutely 

 preclude the possibility of mistaking distorted 

 red cells crescentic in shape, or a crescentic mass 

 of platelets, for parasites. In neither of these is 

 there a definite central pigment mass, nor should 

 a foreign body be mistaken for a crescent. 



