Nothing definite is yet known with regard to the transmission of the parasites by an alternate invertebrate host, although there is presumptive evidence in favour of this supposition.2 A word or two must be said in conclusion with reference to the supposed connexion of the Spirochaetae with the n Trypanosomes.
The fact of death may, in English law, be proved not only by direct but by presumptive evidence.
The muzzle probably formed a snout in life; and there is presumptive evidence that these animals were very long-lived.
Of the discoveries of new organisms the most important is that of the Spirochaete pallida in syphilis by Schaudinn and Hoffmann in 1905; and although proof that it is the cause of the disease is not absolute, the facts that have been established constitute very strong presumptive evidence in favour of this being the case.
That its analogues were chiefly used as sepulchres has been fully established, and this is presumptive evidence that the sepulchral element was, at least, one of the objects for which Stonehenge was constructed: and it was probably for this reason that it was erected on Salisbury Plain, where there already existed an extensive necropolis of the Bronze Age.