[76] Bernardino de Sahagun, Historia general de las cosas de Nueva España, ed. C. M. de Bustamente, México, 1830, Vol. 3, p. 56. [77] See, Franz Boas y Manuel Gamio, Album de colecciones arqueológicas, México 1912. One of the simplest designs is instructive in regard to the effect of slurring and the development of individual style. One of the decorative elements consists of a series of S shaped, interlocking figures (fig. 124). It will be noticed that, in fig. 124 _b_ the lines which seem to have developed from the S shaped forms, are degenerating into simple curves, while in _c_ the lines are drawn more carefully. Fig. 124 _d_ represents the decoration from the outer side of a vessel and here the S shaped curves have been carefully connected and are developing into a new pattern. [Illustration: Fig. 125. Designs from pottery vessels, Culhuacan.] Another simple pattern which illustrates the effect of rapid production consists of a regular repetition of a curve and two vertical strokes. It seems likely that the form is derived from a circle followed by vertical strokes such as are also found in the finely painted pottery of Texcoco (Fig. 125 _a_). The corresponding Culhuacan specimens are shown in fig. 125 _b_, _c_. While in a few cases the curve is a more or less carefully drawn circle (_b_, _c_), it has generally the shape of a spiral. One of the most striking characteristics of the development of this pattern is the tendency to change the direction of the vertical strokes to an inclined position (fig. 126). According to the tendency of the painter the strokes incline either strongly from right above to left below (_a_, _b_ inside, _c_, _d_ outside), while in _e_ and _f_ the strokes run from the left to the right. In the rapid creation of these forms the vertical lines are transformed into hooks. They are so characteristic that it seems perfectly feasible to recognize the same hand in these specimens. There is still another way the design is treated. In fig. 127 _a_ the spiral lies in the direction opposite to the one usually given to it and a single dividing vertical line is placed between the two spirals; the end of the first spiral taking the place of the second vertical line. Here again the method of treatment is consistent. In a few cases the spiral line instead of terminating abruptly is continued under the vertical strokes (_b_). In still another case, a separate single or double horizontal line is placed under the spiral (_c_). [Illustration: Fig. 126.] [Illustration: Fig. 127.] [Illustration: Fig. 128. Designs from pottery vessels, Culhuacan.]