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HIS week's issue of SCIENTIFIC Opinion completes its Third Volume,

and brings the existence of this Publication, in its present form and under its original Editor, to a close. The proprietorship and conduct of SCIENTIFIC OPINION have now passed into other hands,

and this Journal will henceforth be incorporated with The English Mechanic and Mirror of Science, an illustrated weekly periodical of great popularity, and one enjoying a very large circulation.

Correspondents in all future communications are therefore requested to observe the Change of Address, and to note that the day of publication is altered from Wednesday to Friday in each week.

Subscribers will continue to receive SCIENTIFIC OPINION in its altered

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form in completion of their prepayments; and it is hoped they will find

increased inducement, in the extended scope of The English Mechanic and Mirror of Science, to renew ihe patronage originally accorded to SCIENTIFIC OPINION.

Books for Review, Advertisements, &c., &c., should henceforth be addressed respectively to the Editor and Publisher, at the Office, No. 31, Tavistock Street, Covent Garden, London, W.C.

Back Numbers, Monthly Parts, Cases for Binding, &c., can be obtained, as heretofore, at 74, Great Queen Street, W.C.

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