300 



ROBERT T. HANCE 



the threes and fours rise to a certain point which is maintained 

 with more or less fluctuation to the end. Chart 4 is drawn from 

 figures based on the average of three cultures and shows the 

 various curves to follow practically the same paths that they 

 did in the preceding graph, and although the twos in this case 



Chart 3 In this chart and in all succeeding ones the axis of abscissa represent s 

 time in days and the axis of ordinates represents percentages. The description of 

 this chart is in the text, page 299. 



Chart 4 'i'his grapli is described on page 300. 



