THE MALARIAL PARASITE. 



633 



undergo within a period of twenty minutes I shall show yon upon 

 the screen at the close of my address (see Fig. 1). 



The confirmation of Laveran's discovery, as already stated, was 

 first made by Richard in a communication to the French Academy 

 of Sciences (February 20, 1882), then by Marchiafava and Celli 







ez. 



!7. 



13. 



0. 



ts. 



es 



sa. 



Si. 



1 



gt. 



Fig. 1. Figures 1 to 22 represent the changes in form n;iiich a single pkismodium, included 

 in a i-ed blood-corpuscle, was observed to undergo within a period of twenty minutes. 

 Figures 23 to 27, 29, and 80 show other forms assumed by plasmodia, some with and some 

 without pigment. Figure 28 shows a miotionless plasmodium emerging irom a red blood- 

 corpuscle ; the blood was taken after the paroxysm of fever and administration of quinine. 

 (_Marchiafava and Celli.) 



(1883), and subsequently by Councilman and by Osier in this 

 country, by Golgi in Italy, by Manson of England, and by many 

 other competent microscopists in nearly all parts of the world 

 where malarial diseases prevail. 



The intracorpuscular development of the plasmodium has 



VOL. L. 47 



