. The Popular science monthly . ay by barter to the coast of the Gulf of California and probablythe peoples to the north and east also obtained it. It is a matter ofunusual interest that the aboriginal Papagos used rubber. Late in1909 an olla, or earthenware jar, was unearthed at some depth on thesite of an ancient village near Sasco, Ariz. In it were two roundmasses of rubber which, aside from a vitreous and fissured externallayer, still displayed the texture, resiliency and odor of a dry and al-most resin-free product. A generous piece (Fig. 5) of one of themasses was presented to thewriter
. The Popular science monthly . ay by barter to the coast of the Gulf of California and probablythe peoples to the north and east also obtained it. It is a matter ofunusual interest that the aboriginal Papagos used rubber. Late in1909 an olla, or earthenware jar, was unearthed at some depth on thesite of an ancient village near Sasco, Ariz. In it were two roundmasses of rubber which, aside from a vitreous and fissured externallayer, still displayed the texture, resiliency and odor of a dry and al-most resin-free product. A generous piece (Fig. 5) of one of themasses was presented to thewriter by Professor A. , of Tucson, Ariz., forstudy, but the microscopic evi-dence does not support the mostnatural supposition that it isguayule rubber, but more prob-ably that it is a latex rubberwhich found its way northwardfrom the more remote parts ofMexico. It is fairly certain,therefore, that rubber was anarticle of barter over a ratherwide stretch of country. At the present time not onlyguayule, but two at least of its. congeners, mariola (Parthe- Fig. 5. Microscopic Appearance ofGuayule Rubber in the Cells of theRubber-bearing Tissue. THE GUAYULE 3*7 nium incanum) and tatanini (Parthenium lyratum) afford mater-ial to the hand of the ball enthusiast of northern Mexico. These twoplants, however, contain rubber in very meager quantity as comparedwith guayule. This method of extracting the rubber, viz., by mastication, very nat-urally suggested the course of manufacture. As early as 1888 it was
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