Finger Prints by Francis Galton : image 0169

ix METHODS OF INDEXING

139

In other respects the difference of merit between the three methods is somewhat greater, as is succinctly indicated by the next table.

TABLE XI, In 100 Sets.

	No. of different index-headings.
Number of Entries under the same head.	All slopes.	i and o fore- fingers only.	No slope.
1	71	63	58
2	10	8	9
3	1	3	1
4	...	2	2
6	1	...	...
13	...	...	1
Total . . .	8 3	16	71

Hence it is evident that the second method of " i-o fore-finger " is capable of dealing rapidly with 100 cases, but that the method of " no slope " will give trouble in twelve out of the hundred cases.

[TABLE XII.

OCR Rendition - approximate