200 Experimental Zoology 
on the other side all the shorter men between 62 and 63.9, and 
continue in this way until all the men are classified, we find a 
triangle-like group (Fig. 20, B). If we join the tops of the 
columns, we get a curve that corresponds in form to the mathe- 
matical curve of probability (Fig. 20, A). 
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Fic. 20. 
The same result may be shown graphically in another way. 
If we take a lot of peas and put all of a size (i.e. within certain 
limits) in’ similar cylindrical jars, and then arrange the jars so 
that the one with the medium-sized peas is in the middle, and 
those with the next larger peas on one side according to their 
size; and those with next smaller peas on the other side accord- 
ing to their size, etc., it will be found that the tops of the piles 
will give roughly the curve of probability. In both of. these cases 
