46 NATURAL INHERITANCE. [chap. 



Data for Eighteen Schemes. — Sufficient data for re- 

 constructing any Scheme, with much correctness, may 

 be printed in a single line of a Table, and according to 

 a uniform plan that is suitable for any kind of values. 

 The measures to be recorded are those at a few definite 

 Grades, beginning say at 5°, ending at 95°, and including 

 every intermediate tenth Grade from 10° to 90°. It is 

 convenient to add those at the Grades 25° and 75°, if 

 space permits. The former values are given for eighteen 

 different Schemes, in Table 2. In the memoir from 

 which that table is reprinted, the values at what I now 

 call (centesimal) Grades, were termed Percentiles. Thus 

 the values at the Grades 5° and 10° would be respectively 

 the 5th and the 10th percentile. It still seems to me 

 that the word percentile is a useful and expressive 

 abbreviation, but it will not be necessary to employ it 

 in the present book. It is of course unadvisable to use 

 more technical words than is absolutely necessary, and 

 it will be possible to get on without it, by the help of 

 the new and more important word " Grade." 



A series of Schemes that express the distribution of 

 various faculties, is valuable in an anthropometric labora- 

 tory, for they enable every person who is measured to 

 find his Eank or Grade in each of them. 



Diagrams may also be constructed by drawing parallel 

 lines, each divided into 100 Grades, and entering each 

 round number of inches, lbs., &c, at their proper places. 

 A diagram of this kind is very convenient for reference, 

 but it does not admit of being printed ; it must be 

 drawn or lithographed. I have constructed one of these 



