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 name to the fact brought him no nearer to an explanation, but even confused it more. He was, in fact, at an end of the means of observation which were possible to him. He had no microscope to carry him farther, as it has done us; though the only effect has been to throw the inscrutable a little back.

It must be said, however, that injustice is done to Harvey if we do not remember that his treatise on Generation is an incomplete work. He had lost the part on Insects; and he also evidently regarded the work we now possess as the commencement only of a complete treatise. Without dwelling further on this great work, I think it may be said that, baffled as he was in his search, it yet shows Harvey’s wonderful power of observation as conspicuously as the treatise on the Circulation.

The mention of the loss of the treatise on the Generation of Insects may remind us that other works of Harvey’s are lost which would be to us of inestimable value. In his second disquisition to Riolanus he