An Introduction to a Biology, 



The numbers at the top of (but outside) the columns 

 stand for the various possible results of second throws, which; 

 as we know, may be anything from to 12. The numbers 

 at the left-hand end of (but beyond) the rows have the same 

 signification, except that they refer to first throws. 



At the base of (but below) most of the columns are num- 

 bers which signify the number of times the event, indicated 



by the figure at the top of the column, happened in the 

 500 second throws. P'or example, a 2 occurred 12 times; 

 a 3, 25 times ; a 4, 51 times ; and so on. At the right-hand 

 end of (but beyond) most of the rows are numbers which 

 signify the number of times the event indicated by the 

 figure at the left of the row happened in the 500 first throws. 

 For example, a 1 occurred 3 times ; a 2, 8 times ; a 3, 24 

 times ; and so on. 



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