Jai 31, 1885.] THE BRITISH MHDICAL JOOURWAL. 2v5 not only a third, but at least three more, namely, those of. Jaccoud, Benedict, and Cyou ; and that it is just this multiplicity of theories which has, as I stated in the first instance, prevented me from quoting them all. To his further question, whether his theory has anything in common with my own, I reply that I not only consider them entirely different, but I also add that I consider his theory to be utterly and radically wrong. Your readers

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... are aware -that what is called the " reeling gait " of patients suffering from cerebellar disease is entirely different from the "ataxic gait" of tabes. This is not the place for describing these differences, which Hughlings Jackson has so ably discriminated; suffice it to say that they exist, and are generally acknowledged to exist. Now, if Dr. Ross's cerebellar theory of ataxy were correct, the walk of a patient suffering from tumour of the cerebellum would be more or less the same as that of another affected with locomotor ataxy, for both suffer from perversion or loss of cerebellar influence. Yet the reverse is the fact ; and my theory,