EVEN the brilliance of the morning sun and the crisp, tangy morning breeze, could not make the bookstall-lined Fourth Avenue block other than a sluggish back-eddy of the city's flood. Grey men dwelt sleepily here among their grey books; men and books equally withdrawn from life. Elsewhere, the eager day was beginning for thousands of school children, stenographers and clerks, laborers and brokers, shopkeepers and mechanics. Here the night's sleep yawned only into a waking drowse, a desultory dealing in tattered volumes, a browsing among out-dated magazines.