The slippery elm (_Ulmus fulva_, Michx.) was found three times. Once,
in a burden strap made by the Iroquois Indians (AMNH 50-6680) in which
the fibers had received some preliminary treatment to soften them and
remove much of the natural gum. Two other specimens, both rather
coarsely woven fabrics from mounds of the Hopewell culture (OSHAM 283
and 125) were in the Ohio State Historical and Archaeological Museum.
The American elm (_Ulmus americana_, L.) was encountered only once in
an Iroquois burden strap (MAIHF 19-4550). The fiber had received some
preliminary treatment and differed decidedly from _Ulmus fulva_ in the
shape of the cells, in cross-section, and the residual amount of
amorphous material.