Page:Popular Science Monthly Volume 50.djvu/653

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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

PSM V50 D653 Plasmodium changes of a blood corpuscle.jpg
Fig. 1.—Figures 1 to 22 represent the changes in form which a single plasmodium, included in a red blood-corpuscle, was observed to undergo within a period of twenty minutes. Figures 23 to 27, 29, and 30 show other forms assumed by plasmodia, some with and some without pigment. Figure 28 shows a motionless plasmodium emerging from 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 Osler 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