In the English department there are about one- and-twenty exhibitors of microscopes and microscopical objects or apparatus, and it will be interesting to inquire how far, and in what directions, improvements or novelties have been introduced in these matters since 1851. Upon the whole, a very great advance is observable. Firstly, in the general style, as it were, and elegance, arising from the accurate adjustment of parts to their purpose, and in the various proportions of the instruments. Secondly, the observer will be struck with the numerous specimens of binocular microscopes, mostly on the construction of Mr. Wenham, to whom microscopists are so much indebted for the great improvement thus introduced in the production of a really efficient binocular instrument, so long a desideratum among opticians. Thirdly, a striking feature in the microscopes of late construction more especially, is the great attention that has been paid to the mode of...

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