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 ing in manuscript, and in obscurity, it is probable they are only similar selections. And indeed it will be found on inspection, that his collections consist of a multitude of entries made at different times, without method, order, or arrangement of any kind, so as to form an immense chaos of intelligence, which he, like many other voluminous collectors, intended at some future time to digest and arrange, but unfortunately postponed this task so long, that he did not live to carry that intention into effect. Under these circumstances, should it happen, as perhaps it may, that any volume of the whole is confined exclusively to any one branch of science, such as hydrostatics for instance, it was not the consequence of a designed plan, but only arose from this accident, that he had then made that branch the object of his pursuit, and for a time laid aside the rest. In proof of this assertion it may be observed, that the very treatise of light and shadow above mentioned, is described as in the Ambrosian library at Milan, and as a folio volume covered with red velvet, presented by Signior Mazzenta to Cardinal Borromeo ; from all which circumstances it is evidently proved to be Rh