A search for nonperturbative effects in the structure functions of deep-inelastic scattering reveals substantial effects which could be due to important physical phenomena or to systematic errors in the experiments. In either case the measurements of ${\alpha }_s$ and $\Lambda$ are seriously jeopardized. $F_2\left(\mu N\right)$, $F_2\left(\nu N\right)$, and $x{F}_3\left(\nu N\right)$ are examined.

• Received 19 April 1982

DOI:https://doi.org/10.1103/PhysRevLett.48.1657