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Updated: June 20, 2025
A right conception of the genesis of a vertebral column, includes not only the differentiations from which result the chorda dorsalis and the vertebral segments imbedded in it; but quite as much it includes the coalescence of numerous vertebral processes with their respective vertebral bodies.
Taking advantage of the space of the plate, figures of the following species from the same country, which have not hitherto been illustrated have been added. They were described or noticed in the list before referred to. Cystignathus dorsalis, t. 1. f. 2. Phryniscus Australis, t. 2. f. 1. DUM. AND BIB. E. GEN. viii. 725. Bombinator Australis, GRAY, PROC. ZOOL. SOC. 1838. 57. III. Mr.
It is but seventy years ago since Ricord, the great French syphilologist, following Bassereau, first taught the complete independence of syphilis both from gonorrhoea and soft chancre, at the same time expounding clearly the three stages, primary, secondary and tertiary, through which syphilitic manifestations tend to pass, while the full extent of tertiary syphilitic symptoms is scarcely yet grasped, and it is only to-day beginning to be generally realized that two of the most prevalent and serious diseases of the brain and nervous system general paralysis and tabes dorsalis or locomotor ataxia have their predominant though not sole and exclusive cause in the invasion of the syphilitic poison many years before.
It is called, in the language of physicians, tabes dorsalis, or dorsal consumption; because it is supposed to arise from the dorsal portion of the spinal marrow.
They are the only living Vertebrates that have throughout life a chorda dorsalis and a neural string above it; the latter must be regarded as the prolongation of the cerebral ganglion and the equivalent of the medullary tube. Their branchial gut also opens directly outwards by a pair of branchial clefts.
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