Boas] GEOMETRIC FORMS 311 
As in the case of straight lines, the zigzags composed of short 
diagonals are given on the whole the same interpretations without 
regard to their vertical or horizontal position. A number of new 
names make their appearance with the vertical zigzag, however, which 
are not applied to horizontal forms. The terms for horizontal ar- 
rangements, but used also for those in vertical position, are snake 
and snake track, caterpillar—especially where broad single diagonal 
lines with subdivided surfaces are used—as well as trail, pack strap, 
and contracted middle. New terms for vertical arrangements are 
ascending zigzag (sketch 104), blanket, parfléche, wave, a 
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and grasshopper or grasshopper leg, depending on the character of the 
lines. Sketch 105, giving the simplest form, is known by the last two 
names. The wave patterns classified by the Indians according to 
the number of angles in the line as of one, two, or three turns, etc., 
may be seen in sketches 106 to 110. The blanket pattern (sketch 
111), is always of several lines in close formation. The lightning 
is an irregular zigzag (sketches 112, 113), which is also known as 
grasshopper, or as woodworm borings. Sketches 114 to 121 are 
given terms similar to those applied to horizontal arrangements. All 
less exact forms of the vertical zigzag which it may be contended 
are attempts at realistic representation, such as 122 to 125, are called 
striped snake. Sketches 126 and 127 of zigzags composed of diagonal 
53666°—28——21 
