However, it is to be observed that the quantitative aspects of experience have always played a very striking role in all his performances. Even in dealing with color he turned to mathematics and made his values quantitative. Throughout childhood he spent hours playing with numerical relationships. These calculations cover hundreds of pages. There is reproduced here a sample of such work, chosen at random from scores of like material. There is no doubt in the mind of the present writer [L. S. H.] that D could, by practice with short-cut methods, easily become a lightning calculator. By age of 12 years D had finished college entrance requirements in arithmetic, algebra, geometry, and trigonometry, all with high marks.
FIG. 7. Playing with numbers, Child D, age 7, to find what number under 100 has the greatest number of factors, counts up factors in each and awards "highest honors" to 96.
[This figure lists the numbers 86-100, and shows the numbers factored. The winning numbers he included are 96 (6 [factors]), 48 (5), 24 (4), and 16 (4). It appears that he ranked the "winning" numbers not according to the actual numbers of the places (i.e., 1st, 2nd, 3rd, and 4th places), but rather by the order of the primes representing them, i.e., 2 is first place, 3 is second place, 5 third, and 7 fourth. Additionally, the notes "H. C. F" and "L C. M." are to the left of the 96 and 16, respectively, likely indicating "highest common factor" and "lowest common multiple" of the factors of the "winning" numbers.]
Tendency to classify and diagram. To classify the data of experience has always been one of D's chief interests. One such tabulation was of parts of speech in various stories and poems. [5] Figure 8 is a sample taken from many pages of reclassification of birds. The caption, "Proper Scientific Name," represents the name considered by D to be better than those now recognized by ornithologists. His classifications of words, numbers, colors, musical notes, objects, and so forth would fill a large volume. He often constructs diagrams to clarify or condense meaning.
FIG. 8. A SAMPLE OF D'S CLASSIFICATIONS
[PART 1 OF 2, Columns 1-3].
Classification of birds seen in summer 1918. Classified in Feb.,
1919. "Proper Scientific Name" is the improved name given by D—.
Found Name Genus or, Scientific
Here (Popular) [Species,] etc. N a m e
* Towhee Species Erythopthalmus
X Wh.-eyed towhee Sub-Species E. Alleni
X Green-tailed " Genus Oreospiza
X Blue Grosbeak Species Caerulea
* Indigo Bunting " Cyanea
X Painted " " Ciris
X Lark Bunting " Calamospiza
Melanocorys
* Barn Swallow " Erythrogastra
* Tree " Genus Iridoprocne
* Red-eyed Vireo Species Olivacea
Wood Warblers Family Mniotiltidae
* Black & White
Warbler Species Varia
* Yellow Warbler Species Astiva
* Sh.-Billed
Marsh Wren Genus Cistothorus
* Red-br. Nuthatch Species Canadensis
FIG. 8. A SAMPLE OF D'S CLASSIFICATIONS
[PART 2 OF 2, Columns 1-4 ("Scientific name" repeated)].
Scientific Name Proper Scientific name Equal