AMAarchives of neurology & psychiatry . Fig. 11.—Spirochetes in swarmlike colonies. Note the few spirochetes out-side of the colony itself. Figures 11 and 12 are photographic reproductions from Plate 4, Figures 9and 12, in an article by Dr. F. Sioli, entitled Die Spirochaete pallida bei derprogressiven Paralyse, Arch. f. Psychiat. 60:401, 1919. again, always with the formation of higher and higher recidive strainsof spirochetes. Such spirochetes as survive in this recidive process(if I understand Ehrlich) would belong to the original syphilitic strainthat entered the body at the time of infect
AMAarchives of neurology & psychiatry . Fig. 11.—Spirochetes in swarmlike colonies. Note the few spirochetes out-side of the colony itself. Figures 11 and 12 are photographic reproductions from Plate 4, Figures 9and 12, in an article by Dr. F. Sioli, entitled Die Spirochaete pallida bei derprogressiven Paralyse, Arch. f. Psychiat. 60:401, 1919. again, always with the formation of higher and higher recidive strainsof spirochetes. Such spirochetes as survive in this recidive process(if I understand Ehrlich) would belong to the original syphilitic strainthat entered the body at the time of infection, but would be alteredbiologically—a special selection of those best fitted to survive; that is,a straight syphilitic strain, but modified by the conditions of growthwithin the host. Moreover, as the recidive strains progress, the placesin which the syphilitic organisms can be found grow fewer and fewer; DUN LAP—GENERAL PARALYSIS 601 the parasites seem to retire in the later stages oi syphihs to certaincircumscribed foci, the
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