...his death, and several sketches by different members of the imperial family. Private Collections. — It would be impossible to give here a detailed account of the numerous private collections in St. Petersburg. We will therefore only mention the most important,...

...conical refraction presents one of the instances — rare in the history of physical science — in which theory was able not merely to account for a...the rays composing the luminous cone is governed. rank among the cultivators of optical science, and in the year 1833 lie was requested by the British...

...his death, and several sketches by different members of the imperial family. Private Collections. — It would be impossible to give here a detailed account of the numerous private collections in St. Petersburg. We will therefore only mention the most important,...

...collodion ns a substitute for paper, these substances being in either case spread over a plate of glass. It would be impossible to give here a detailed account of the different photographic processes, which are both numerous and continually receiving modifications and...

...migrants, and 62 only occasional or rare visitors. It is estimated that 127 species nest in the county. It would be impossible to give here a detailed account of the birds of the county. The higher mountains of the Highland area afford an occasional resting-place for...

...migrants, and 62 only occasional or rare visitors. It is estimated that 127 species nest in the county. It would be impossible to give here a detailed account of the birds of the county. The higher mountains of the Highland area afford an occasional resting-place for...