ON THE TOXIC CONSTITUENTS IN THE BARK OF ROBINIA PSEUDACACIAL. 343 
The precipitate produced by the addition of lead acetate, contains a 
poisonous ingredient and affects Guinea pigs. Therefore, we may assume that 
it perhaps contains Power’s robin. 
III. PuysicAL AND CHEMICAL PROPERTIES OF RoBiTIN. 
Robitin is a pure white, odorless, somewhat bitter, hygroscopic amorphous 
powder and easily dis:olves in water and acids forming a transparent, reddish 
brown solution, but it is insoluble in ether, methyl alcohol, ethyl alcohol, amyl 
alcohol, benzene, petroleum ether, chloroform and acctone. Its aqueous solution 
reacts neutral and does not lose its toxicity by exposure to sunlight or heating 
at a temperature of 100°C. for 2 hours and half. 
Robitin is glucoside but not au alkaloid or a protein. 
Acid robitin solution 
Reagent - 
103 5% 
ITOn&Besquichloride ee en enanuen negative negative 
AUTON, Gon ee 2 ots: 3 sic\e. fein « u 9 
Phosphomolybdic acid Y.7............- £ » 
SWOT. an 8 65 ee ” 99 
IPOLRSSIU NARI OGIE Mee a, ANE, es „ » 
Potassium mercury iodide.............. cr " 
Phosphotangustic acid. ...i<..2:....00 x „ 
ELANCE agrenterte een ee ” 
Reaction Robitin aqueous solution (1%) 
Mey TMege. (oa RE RE RE negative 
Xanthoprotein reaction ................ ” 
INITIO: Se TCACUON MMe ete meee) os wis eqs «ene » 
Adam Kiewiez’s reaction .......... , 
Liebermann’s reaction ............. x 9 
PMO RS peek, S555 Saber seg ae eee „ 
IN CELL AOL Re Reed dee cheeses » 
AUNTS, Aubert 75 = eine ee aI ” 
As Power’s robin is considered to be a kind of nucleoprotein, we tested 
the trypsin digestion for robitin, but the result was negative. 
