86 BACTERIOLOGICAL AND ENZYME CHEMISTRY 



etc., while the corresponding alcohols are generally given the 

 termination ite or ol ; we have, therefore, the following series 

 of alcohols and corresponding sugars, the aldose and ketose 

 form being given in each case : 



CH 2 OH 

 CH 2 OH 



Methylene glycol 



CHoOH 

 CHO 



CH 2 OH 



CHOH 



CH 2 OH 



Glycerol 



CHOH CO 



Glycol aldehyde 

 or 



CH 2 OH 

 CHOH 



CH 2 OH 



Tetrite 



CHO 



Aldose 



CH 2 OH 



Ketose 



Glycerose or Triose 



CH,OH CH 2 OH 



(CHOH) 3 

 CH 2 OH 



Pentite 



(CHOH) 4 



CH 2 OH 



Hexite 



CH 2 OH CH 2 OH CH 2 OH CH 2 OH CH 2 OH CH 2 OH 



I I II II 



(CHOH) 2 CHOH (CHOH) 3 (CHOH) 2 (CHOH) 4 (CHOH) 3 



CHO CO 



CHO CO 



CHO CO 



Aldotetrose CH 2 OH Aldopentose CH 2 OH Aldohexose CH 2 OH 



Ketopentose 



Ketotetrose 



Ketohexose 



Sugars containing seven, eight or nine atoms of carbon 

 have been obtained, viz., heptoses, octoses and nonoses, but 

 the above list includes those sugars which are met with in 



