In 1905, Schaudinn discovered the syphilitic treponema in man.
Since then, thanks to the labours of Argutinsky and Schaudinn, our knowledge of the malarial parasites has steadily increased.
This is the characterization given A. sol by Schaudinn, and it applies perfectly to the freshwater forms.
This disease is caused by a microorganism known as the spirochaeta pallida or treponema pallidum of Schaudinn and Hoffmann.
The marine form found at Woods Hole probably belongs to this species, as described by Schaudinn.
In one form the jelly is impregnated with needles of magnesium carbonate (Schaudinn), but these are absent in the other form.
From them Schaudinn decided that the poisonous action of the mosquito bite is caused by an enzyme from a commensal fungus.
Much more detailed, and the more important experiments made along this line, are those of Schaudinn .