XI. CMTkrATAL ZONES. 



487 



region and each zone. By looking at the columns of 

 figures in that census, any order may be traced across the 

 six zones, and its more or less rapid decrease may be dis- 

 cerned at a glance,— occasionally, its relative increase, or 

 even its absolute increase upwards in Saxifragace<e and 

 Lycopodium. But the numerical value (and consequent 



