C. E. Avery on the Nitrate of Silver Test. 255° 
chlorophyl, which has been even in a feeble degree subjected to 
acids, can be considered as a constituent of chlorophyl. 
Comptes Rendus, Ixi, 436. M. A. Trécul observes what he 
thinks to be naturally crystallized chlorophyl, in cells in the 
bark of Lactuca Altissima. 
Liebig & Will’s Jahresbericht, 1863, p. 561. Stein remarks 
that the red spots in the flowers of Aesculus Hippocastanum, 
also the flowers of Aesculus Pavia, which are first yellow then 
red, are turned green by alcoholic solution of soda. In other 
AR. XXII —On « Modified Form of the Nitrate of Silver . 
Lest for Arsenic Acid; by Cuartes BE. Avery, Student in 
the Massachusetts Institute of Technology. 
Since arsenate of silver is slightly soluble in an aqueous 
Solution of nitrate of ammonium, and readily soluble both in 
ammonia and dilute nitric acid, it is not easy to detect 
quantities of arsenic by means of nitrate of silver, as 
employed, unless the test be applied with extreme ¢ 
