The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907 . {pseudopodid) and had swallowed some foreignbody, which shows as a rounded dark mass. As thenucleus did not show in this specimen. Fig. 48 B hasbeen added, a drawing from an individual which hadbeen preserved and artificially stained, by which doubletreatment, as you see, the nucleus has been renderedconspicuous.^ Of course in the living specimen thenucleus was equally present although hidden by over-lying granules. Our Amceba is a unicellular parasitic It gives me pleasure
The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907 . {pseudopodid) and had swallowed some foreignbody, which shows as a rounded dark mass. As thenucleus did not show in this specimen. Fig. 48 B hasbeen added, a drawing from an individual which hadbeen preserved and artificially stained, by which doubletreatment, as you see, the nucleus has been renderedconspicuous.^ Of course in the living specimen thenucleus was equally present although hidden by over-lying granules. Our Amceba is a unicellular parasitic It gives me pleasure to thank Dr. W. T. Councilman for the loan of thisspecimen, obtained from the intestine of a fatal case of amoebic dysentery. Itis on Dr. Councilmans brilliant investigations that our knowledge of this diseaseis based. DIFFERENTIATION AND REJUVENATION 139 organism with scarcely any differentiation of its struc-ture. The next of the slides shows us again anotherof these parasitic simple organisms, namely Plasmo-diziTn vivax, the cause of tertian malarial fever. Thetiny creature inhabits the blood corpuscles of man ;. Fig. 4q. Tertian Malarial Parasite, Twohuman blood corpuscles alongside and drawnon the same scale, by E. S. Kilgore. when it enters the corpuscle it is very minute,scarce an eighth of the diameter of the corpuscle ; itgrows very rapidly, feeding on and destroying thecorpuscle and yet meanwhile by its own growth caus-ing the corpuscle to enlarge. Our picture. Fig. 49,shows three human red blood corpuscles, two in theirnormal condition, the third (on the right) distendedby the overgrown parasite, which is heavily chargedwith pigmented granules, and almost completely fillsthe corpuscle. The nucleus at this stage of the 140 AGE, GROWTH, AND DEATH parasites development is distributed as a series ofsmall scattered granules, which cannot be demon-strated satisfactorily until they have been artificiallycoloured. The parasite itself is a small mass of un-differentiated prot
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