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OCR Rendition - approximate
Ix METHODS OF INDEXING 141 cent of the sets fell, when the method of " i and o in fore-fingers " was adopted ; also the respective percentage of the cases that fell under them. In the right half of the table are the corresponding indexheadings, together with the percentages of frequency, when the "no slope" method is employed. These are distinguished by Roman numerals. The great advantage of the " i and o fore-finger " method lies in its power of breaking up certain large groups which are very troublesome to deal with by the " no slope " method. According to the latter as many as 9.2 per cent of all the entries fall under the index-heading marked III., but according to the " i - o fore-finger " method these are distributed among the headings 3, 4, and 5. The " all slopes " method has the peculiar merit of breaking up the large group Nos. 11 and VIII. of " all whorls," but its importance is not great on that account, as whorls are distinguishable by their cores, which are less troublesome to observe than their slopes. The percentage of all the entries that fall under a single index-heading, according to the " i-o forefinger " method, diminishes with the number of entries at the following rate TABLE XIII. Total number of entries, 100 300 500 Percentage of entries falling under a single head 63 49.0 39.8
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