PRESENCE OF A TRUE MANNA ON A BLUE GRASS. 299 
nor was the copper reduced after a solution had been boiled in 
dilute acid, so that the substance does not undergo ayer by 
this method. 
6. The crystals melted at 165° - 166° C. in glycerol in tube 
closed at end. 
7. The crystals dissolved in concentrated sulphuric acid without 
darkening. 
8. When boiled with potash an aqueous solution is not darkened. 
9. With ammonio-sulphate of copper, a blue precipitate was 
obtained, soluble in ammonia, and this solution was not altered 
on boiling. 
10. With ammonical lead acetate a white precipitate was 
obtained. 
11. When an aqueous solution was added to either lime or 
baryta water, and alcohol added, precipitates were obtained. 
12. The purified substance was swect to the taste. 
13. When treated with strong nitric acid, and heated until the 
evolution of gas ceased, the oxidation products formed gave the 
reactions for saccharic and oxalic acids, no mucic acid was 
detected. 
14. When the purified crystals were heated to 105° C. for half 
an hour, no change in weight took place, nor was there any alter- 
ation when heated to 116° C., so that the crystals are anhydrous 
at that temperature. 
15. Combustion was made of perfectly purilied material with 
the following result :— 
2538 gram gave ‘3658 gram CO, 
and (1766. 4 H.O 
Which is ecual to 39-31 per cent. carbon 
072 we hydrogen 
52-97 a oxygen. 
From which we may deduce the formula 0,H,,O, or that of 
mannite, 
