1894. THE PARASITES OF MALARIAL FEVERS. 



197 



red colouring matter or haemoglobin which it takes in, as small scattered 

 grains of a black pigment or melanin : further stages show the growth 

 of the parasite and increase in the amount of pigment, until in Fig. i 

 the whole corpuscle is occupied by the parasite. Nutrition is thus 

 stopped and spore formation commences. In I this process is com- 



a 



J- 



y 





•V 



-;^.^, 



m 





y)© 



^'-,^ 



>fM 



Vi1 



m 



Parasites of Malarial Fever. 

 (For explanation, see end of Dr. Gregory's Paper.) 



plete and the next figure shows the free spores. The last two figures 

 of the series show a less normal development that sometimes takes 

 place : here the whole parasite is set free by the rupture of the blood 

 corpuscle. The particular species illustrated in Fig. II. runs its life- 

 cycle in three days, and therefore produces the so-called quartan 



