Reviewing Matthew Arnold???s letters Stefan Collini (LRB, 20 January) writes: ???Reflecting during a frosty December on ???how a fire to get up by is perhaps the greatest comfort in the world???, Arnold was a man of his time and class in making no mention of how the fire might have got there.??? Readers acquainted with Arnold???s poetry will remember the extended simile in Sohrab and Rustum:As som