ALL day long over the gray Islington Street October, casting pearly mists, had turned the sun to silver and made London a city of meditation whose tumbled roofs and parapets and glancing spires appeared hushed and translucent as in a lake's tranquillity.The traffic, muted by the glory of a fine autumn day, marched, it seemed, more slowly and to a sound of heavier drums. Like mountain echoes street cries haunted the burnished air, while a muffin-man, abroad too early for the season, swung his bell intermittently with a pastoral sound. Even the milk-cart, heard in the next street, provoked the imagination of distant armor. The houses seemed to acquire from the gray and silver web of October enchantment a mysterious immensity. There was no feeling of stressful humanity even in the myriad sounds that, in a sheen of beauty, floated about the day. The sun went down behind roofs and left the sky plumed with rosy feathers. There was a cold gray minute before dusk came stealing in, richly and profoundly blue: then night sprang upon the street, and through the darkness an equinoctial wind swept, moaning.