In maritime law. Any atmospheric condition (including not only fog properly socalled, but also mist or falling snow) which thickens the air, obstructs the view, and soIncreases the perils of navigation. Flint & P. M. R. Co. v. Marine Ins. Co. (C. C.) 71 Fed.210; Dolner v. The Monticello, 7 Fed. Cas. 859.