Busied in this, I walked on for several hours, during which the mist deepened around me to so great an extent that at length I was reduced to an absolute groping of the way.

忙着在此，我往前走了几个小时，在此期间，雾气在我周围加深如此之大，以至于在我的长度减少到的方式绝对摸索。