Report of first expedition to South America, 1913 . Fig. 3Isolated endothelial r^-ttr- Fig. 4 Section showing cycle of Bartonella bacilliformisin endothelial cells of lymphatic glatid. Plate VI —Oroya Fever DESCRIPTION OF PARASITE 29 ever}^ field of the microscope are invaded by the parasites, andnumbers of both rounded bodies and bacillary forms arefrequently observed in a single cell. The organisms areendowed with definite motility, which amounts to slow transi-tion and is totallj^ distinct from that of pedesis. To observethis it appears advisable previously to warm the slide and toex
Report of first expedition to South America, 1913 . Fig. 3Isolated endothelial r^-ttr- Fig. 4 Section showing cycle of Bartonella bacilliformisin endothelial cells of lymphatic glatid. Plate VI —Oroya Fever DESCRIPTION OF PARASITE 29 ever}^ field of the microscope are invaded by the parasites, andnumbers of both rounded bodies and bacillary forms arefrequently observed in a single cell. The organisms areendowed with definite motility, which amounts to slow transi-tion and is totallj^ distinct from that of pedesis. To observethis it appears advisable previously to warm the slide and toexamine the preparation immediately after it is made. Inred cells in which several of the parasites are visible it is easyto observe their frequent change of position within the celland with reference to one another. The rod-shaped formswere observed to glide slowly in the direction of their longdiameter and to exhibit a slight bending in their transition inthe red cell, and at times both these and the rounded bodiesmight be seen to occupy in turn all portions of it. They wereneve
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