  The tensile strength of fused silica fibers is believed to approach its
intrinsic value at low temperature, and modern experiments indicate very small,
perhaps unmeasured, intrinsic dispersion in this strength. I consider the
application of classical ``weakest link'' models to this problem in an attempt
to determine the number and therefore the nature of the failure sites. If the
skewness as well as the dispersion (Weibull modulus) of failure strengths are
measured it may be possible to determine both the number of sites and the
distribution of their strengths. Extant data are not sufficient, but I present
calculated skewnesses for comparison with future data.
