424 EFFECT OF TEMPERATURE UPON FACET NUMBER 



Rate 



Temperatare 



Fig. 8. A theoretical van't Hoff curve (T). The rate at 10° is arbitrarily taken 

 as 10, at 20° it becomes 20, and at 30° it is 40. The reciprocal of the Ultra-bar 

 female facet number curve (F) is shown superimposed. The curves are thrown 

 into juxtaposition by taking the value 20 for facets at 20° and then calculating the 

 remaining values by applying the Qti-t2 values, as given in Table X. 



