1893.] Presents. 57 



In addition to the evidence derivable from the positive characters 

 mentioned as possessed by the CnO reducing product, there is the 

 corroborative evidence to be taken into account supplied by the 

 characters of agreement observable between my primary non-reducing 

 product and Landwehr's " animal gum." As already shown, the 

 product in question can be thrown down, precisely like " animal 

 gum," in combination with copper oxide, and is afterwards recover- 

 able and convertible into a CuO reducing body, which yields with 

 phenylhydrazine a crystalline osazone. The micro-photos, supplied 

 show two kinds of crystals, one consisting distinctly of the long 

 needles of glucosazone. In its ready mode of separating out, the 

 osazone was observed to agree with that derived from glucose. A 

 10 per cent, strength of sulphuric acid was employed in obtaining the 

 CuO reducing product operated upon. 



Presents, June 8, 1893. 

 Transactions. 



Berlin : Gesellschaft fur Erdkunde. Zeitschrift. Band XXVIII. 



No. 1. 8vo. Berlin 1893. The Society. 



Brussels : Societe Malacologique. Annales. Tome XV. Fasc. 2. 



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