326 Kremers—On the Classification of Carbon-Compounds. 
finds a breathing spell in which to sift and rearrange the new 
material he is trying to assimilate, as well as the old, according 
to new ideas. This is certainly strikingly apparent in our 
text and reference books. To call attention to it and indicate 
a way that will lead out of the difficulty may be worth the time 
spent in writing this short article. 
Madison, Wis. 
