BULLETIN OF THE BUSSEY INSTITUTION. 65 
Samples of maple sugar, maple syrup, and a magma of sugar 
and syrup that was practically a molasses, were procured from a 
source which ensured the purity of these products. The samples 
were known to be genuine and unmixed with sugar from any other 
source than the maple tree. In the case of the sugar, lumps as 
large as small chestnuts were dissolved in 2 cc. of water and 
to some of these solutions were added 12 drops of the solution of 
phenylhydrazin hydrochlorate and sodium acetate described on 
page 14 of the previous number of this Bulletin, while to others 
were added 12 drops of the ordinary phenylhydrazin acetate 
reagent. No indications of mannose-hydrazone were detected in 
any of these trials. 
In the case of the syrup, one test was made by mixing together 
1 cc. of the syrup, 1 cc. of water, and 12 drops of the solution of 
phenylhydrazin hydrochlorate and sodium acetate just now alluded 
to; another test was made by mixing 1 cc. of the syrup, 1 ce. of 
water, and 12 drops of the ordinary phenylhydrazin acetate 
reagent, and yet another by mixing 5 cc. of the syrup with 1 to 
2 cc. of the phenylhydrazin acetate reagent. No indications of 
mannose-hydrazone were obtained in either of these tests. 
In the case of the molasses also, one test was made by adding 
to 1 ce. of the liquid portion of the molasses, 1 cc. of water, and 
16 drops of the phenylhydrazin hydrochlorate and sodium acetate 
solution above alluded to; and other test was made by mixing 
1 cc. of the liquid molasses, 1 cc. of water, and 16 drops of the 
ordinary phenylhydrazin acetate reagent. In neither instance 
was any indication of mannose-hydrazone detected. 
Much more elaborate tests both of the syrup and the molasses 
were then made in a different way, and in some instances much 
larger quantities of the materials were operated upon. As regards 
the syrup proper, some 25 to 30 cc. of it were treated with a few 
drops of basic lead acetate, prepared according to Parrish, as 
mentioned in a note on page 42 of the previous number of this 
Bulletin, and the heavy, white gelatinous precipitate was collected 
and washed with cold water. ‘To the filtrate from this first pre- 
cipitate more of the basic lead acetate was added and the new 
gelatinous, white precipitate was collected and washed in its turn. 
No new precipitate fell on adding the basic acetate of lead to the 
filtrate from the second precipitate. Each of the precipitates 
