Fees 
J fi 
ira : 
_ and is cited from him by Gmelin in the third edition of his Hand-book 
of Chemistry, vol. ii, p. 733—Eps. - eS 
280 Miscellaneous Intelligence. 
direction to the glass by means of a screw, serves to remove, produc- 
ing by this means the exact thickness of layer which is required. The 
frame is furnished along one of its sides with an indented ridge, to 
which a wheel provided with an external handle corresponds, so that 
the frame can be made to move with such velocity as the operation 
-may requi 
re. 
5. New Method of Engraving Plates for Printing Ferns, Sea 
Weeds, §&c., (Atheneum, No. .)—At a recent meeting of the 
polished marble; then taking and softening a pi f gutta percha, 
of proper size, and placing on the leaf and pressing it carefully down, 
it will receive a sh accurate impression fro ant. The 
have been executed in Sheffield. As it is, Dr. Branson has had many 
brass plates thus produced from sand-casting, which required only 4 
might easily be taken for it. Besides these matters, the doctor hae 
ited a large variety of patterns of embossed leather, which had been 
produced by a somewhat analogous operation. As, however, this latter 
invention is not so much for copying designs as for creating them, an 
sion is taken in gutta percha; from that a secondary one, which 0 
being cast in brass, as before, may be used for printing or embossing In 
the ordinary way. The reader stated that his main difficulty was 10 
getting the last gutta percha coat to separate from the mould of the 
same substance into which it was pressed. He had found, however, 
that by powdering both the surfaces with common bronze dust, before 
taking the impression, they did not adhere. 
‘ ugar in flowers of Rhododendron ponticum.—Prof. 
Grorce Jxcer of Stuttgardt writes us that the existence of cane 
r in the flowers of the Rhododendron ponticum, announced as as- 
“certained by Dr. B. Shlamer in volume x, p. 113 of this Journal, was 
first determined by him and published in the year 1825 in the Zeits- 
chrift far Physiologie von Tiedemann and Treviranus, vol. xi, P> - 
> 
