320 COILED BASKETRY IN BRITISH COLUMBIA [ETH. ANN. 41 
angled triangle occurs rather infrequently. Sketch 305 (pl. 84) is one 
of afew examples. Here, on account of the treatment of the surface, 
the figure is known as a butterfly wing. The usual arrangement is 
that of a vertical series in which all the triangles are facing in one 
direction with the longer cathetus forming a straight line. From 
these circumstances it seems probable that the derivation of the 
half-arrowhead may have originated in either of two ways, or that 
both may have been in part responsible. One was the splitting of 
the vertical series of full arrowheads lengthwise, as may be seen in 
sketch 278 (p. 319), the other the automatic production of half- 
arrowhead series as reverse patterns for series of full triangles on a 
vertical strip, as may be noted in sketch 257 (p. 319). 
There is even a third possibility which is illustrated in sketch 303. 
Here the same variety of arrowheads is produced as the reverse 
pattern for the series of rhomboids in a vertical stripe. The series 
| 
289 
288 290 291 
284 285 287 298 994 
295 
SZ 
SS 
Sa 
ANA 
Ley 
SS 
Sa 
Pa 
NINN 
wa 
ZA 
~ 324 
Ny 2 ww . mI 
G 
=o 299 ‘O 
297 298 iss 301 go2 303 325 
on either side of the stripe point in opposite directions, however. 
This does not happen in reverses of triangles. Although rhomboids 
on the whole are rather uncommon, it is advisable to consider them 
as the main design here since they occupy the center of the strip. 
That half-arrowhead series are not necessarily used in pairs may be 
seen in the sketches 287-293. The relation of 293 to 292 shows how 
the presence of vertical outlines at once produces a reverse. Sketches 
294-297 give some rarer forms which are interpreted as tree ladders, 
with notches or short limbs all around the log. Such a ladder was 
used for scaling cliffs and was probably placed upright. There are 
a number of odd arrangements such as are shown in sketches 298-302. 
Parfléche patterns are shown in sketches 322-325. It is not improb- 
able that the whole idea of placing triangles on top of each other in 
this manner was taken over by the Thompson from Plains art, 
although they seem to have preferred using triungles which are all of 
