272 PENTOSURIA 



If it be further remembered that nine cases have been detected in Sal- 

 kowski's laboratory and in the First Medical Clinic of Berlin, the afEection 

 cannot be so rare as many believe. Hence a knowledge of this disturbance and 

 of the means to its diagnosis is an absolute necessity for every physician. 



Briefly the most important diagnostic factors are as follows : Positive 

 orcin test with negative fermentation test proves pure pentosuria; positivo 

 orcin test and positive fermentation test denote pentosuria and glycosuria. 



A turning to the right of the polariscope does not prove the non-existence 

 of pentosuria, for dextro-rotary pentose also occurs in the urine. 



