y obvious, and one can imagine the joy ofthe representatives of the Army Medical Departmentat the apparition of a flock of these swift vaccine car-riers in a besieged town. Blue Transparencies. Beautiful blue transparencies may be produced,according to M. Rossel, in the following simple way… … Fig. 2.-LVUIN0US STABS OH SLACKSOABD. potash. After the print has again been well washed,it is allowed to dry, and then rendered transparent byplacing it on a warm glass plate and treating it care-fully with paraffin. The print is then framed betweentwo glass plates. The above-mentioned…
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