342 ANALYSIS or WINE. 



lead, and dissolved in excess of the same. The quan- 

 tity was very insignificant, not sufficient to allow of 

 its properties being examined, a process which would 

 probably be difficult in any case. 



3. To the liquid which flowed from the precipitate 

 of basic acetate of lead, basic acetate of lead together 

 with ammonia were again added. A yellow flocculent 

 precipitate was obtained. After this had been sus- 

 pended in water, sulphuretted hydrogen passed 

 through it, and filtered, a liquid clear as water was 

 obtained, which was freed by being warmed from 

 sulphuretted hydrogen and ammonia. 



No precipitate was obtained by adding basic acetate 

 of lead to a portion of this liquid ; so that no glucic acid 

 in a form which allows of precipitation exists in it. 



Test solution of oxide of copper and potass indi- 

 cated at once and without trouble the existence of 

 sugar (uncrystallisable sugar), which when ex- 

 posed to evaporation is speedily transformed into 

 glucic acid. 



Besides sugar and a trace of an organic substance, 

 which (as in the liquids previously mentioned) became 

 more and more coloured when exposed to evaporation, 

 there was nothing present except a little gum, indicated 

 by precipitation with alcohol. 



The sugar is so very easily decomposed that its 

 solution cannot be evaporated without becoming 

 dark-coloured and passing into glucic acid ; so that 

 basic acetate of lead mixed with the solution gives 



