30 H ^-m 4A- * o IE? o -a 5i' r- m ^ X 



was added to tlie filti-atc, when a flocculent substance of quite wliite colour was 

 abundantly produced. The insohible lead ccnnpound thus result(;d was collected 

 on a " Nutscli " filter with suction, well washed with water, suspended in water 

 and decomiX)3ed by hydrogen su]|)liide. After the decomposition was complete, it 

 was filtered, and well washed with water, and then the filtrate was evaporated to 

 a small volume in a partial vacuum. The sjrnp was then extracted with boiling 

 9i)% alcohol and separated into two x^arts of soluble and insoluble, the former 

 being predominate in quantit}'. Tlie insoluble part of a slightly dark colour was 

 designated as the residue (II) and preserved in a desiccator as the material for 

 the later investigation. The soluble part was again concentrated to a syrup. 



The purified syrup did not i^roduce any marked crystals even after standing 

 for about one week. Hence, an attempt was made once more to clarify the syrup 

 by means of absolute alcohol, i.e. the syi'up was extracted many times with a 

 small quantity of absolute alcohol until, after evaporation (^f alcohol, no more 

 residue was produced, and it was thus se^^arated into two parts, soluble and in- 

 soluble, in absolute alcohol. The extracts were united and concentrated again into 

 a small bulk. The insolube substance of quite white colour had a sweetish taste 

 and was x^reserved in a desiccator as the material for a further study, designated 

 as the residue (III). 



When the twice x)urified syruj) Avas left untouched for about twenty-four 

 hom"s, it was found thickly laden with fine crystals. A small amount of 95% 

 alcohol was then added to the syrup, mixed, filtered with suction and washed 

 with absolute alcohol and ether. The sugar thus obtained was x^erfectly white in 

 colour and left no ash on ignition. After drying over sulphuric acid in a vacuum, 

 its si^ecific rotatory power was determined and found to be +66.53°. 



For the detennination of specific rotatory x)ower, 0.4551 gram of the 



sugar was dissolved in 25 cc. of water and i^olarized in a tube of 200 mm. 



length. A dextro-rotation of 7,0 on the scale of Schmidt and Haensch half 



shadow x>olariscope was observed. The specific rotatory xx)wer is 



(a)D = l:5-^iMi?A25_= -^ 66.53 (at 20°). 

 ^ 0.4551 X 2 ^ ^ 



The melting i)oint was also determined and observed to be 160°. The specific 

 rotatory power and melting i^oint indicates that the sugar at liand is no other 

 tlian sucrose. 



