Show grow rubber in united states heretofore it was supposed ased that mexico with its guayule rubber tear bear ing shrub had a monopoly on this continent of ae the production of rubber the survey now being made by ibe university of 0 california however bo lias has located more than twenty varieties of bushes five ot of them far surpassing III IB quality it 1 not quantity the guayule Gaa GWI yule Fule wholly within the united states proper already shrubs estimated to contain more than pounds of biest quality rubber have been largely mapped says motor |