process of discoloration may not be commonly used in America, judg- 
— some paper I have seen, I make a brief mention of the subject. 
Lhe researches were made here by a manufacturer who conbines in 
a egree science and technology Gélis recognized at first 
warning of color was not due to any alteration in the ligneous 
, and was she to iron, But wha iron ? and 
Impregnates the paper. Colorless itself, this chlorid gradually absorbs 
wen On exposure to the air, and thus the coloration takes place. 
is therefore not a remedy against iron but against chlorine that is 
Tequired, The hyposulphite of soda is the simple antidote, and a very 
into oe. acid. 
For testing the complete removal of the chlorine, M. Gélis uses a 
liquor made of iodid of potassium and amidon (starch). This liquor 
becomes j instantly blue if there is the least trace of arsine: 
ae loring ap Aironet: the Food of the Silk-w ms.—The inter- 
researches 
of animals ior Che matters taken with their food, are well 
a These obsery appear to have i arty an Teabe ale 
the erat For son which ee i 
ertheless a long step has been taken through tho experiments of M. 
tela who vio employed the pang 08 the red colorin oring matter used by 
“mulberry with this substance and has thus obtained beautiful 
Poa of a rose red ie See nee in tint pa a pparently permanent. 
i 
Commercial men a circular i ie 1 i or asco and with no indi- 
its origin, announcing a large adulteration of the sulphate of 
Minne by a product little known, the sulphate of quinidine. It has 
ie Much interest among dealers in quinine, and many method 
been 2 ig en for detecting the presence of quinidine in sulphate 
as organic base has been studied successively by MM. Henry 
oe dre, Winckler, Howard, Zimmer, and Leers. MM. Henry and 
ondre, its Scape soseiaaced ita ag of _suiniiee MM. 
Stomp fom Vol. XV, No. a Morth, 18 
