The Parasitic Theory of the Causation of Malignant Tumours

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    IT is perhaps not to be expected that in the present state of our knowledge of the relation of lower animal parasites to morbid growths any very definite opinion can be given on certain of the points raised in the small monograph now under review, and, especially, as to the accuracy of the opinions put forward. Indeed we imagine that many readers, after surveying with interest the arrangement and character of the work, will come to the conclusion that whether the theories advanced by the author are ultimately accepted or not, he has certainly not brought forward sufficient evidence in support of his thesis, and that had the energy and skill expended in polemical discussion and theoretical statement been brought to bear in carrying out more extended observations and the accumulation of facts, a very large amount of definite information might have been contributed to this very interesting subject. The interpretation put on the observations of others, and didactic assertion, can never be accepted in lieu of accurate observations, and a mere statement as to the inaccuracy of the work of the older observers, unless it is backed by prolonged investigation and accurate description, can never take the place of such older work.

    Cancer, Sarcoma, and other Morbid Growths considered in Relation to the Sporozoa.

    By J. Jackson Clarke (London: Baillière, Tindall, and Cox, 1893.)

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