出宣武门不远,路西第二个路口是达智桥胡同。进了达智桥,往南头一条胡同便是校场头条。顺着头条走上一半,就会见到两株高大挺拔的合欢树窜出小院的一袭灰墙,绿叶丛中露出团团粉红色绒乎乎的小花,散发出阵阵淡淡的花香,让半条胡同都清爽起来。那绿云映掩的小院就是我的父亲——吴晓铃先生的故居。他的书斋“双棔书屋”便得名于院中那两株合欢树。早在三十年代中期父亲就读北京大学时,就开始买书了,他遍访海王邨书肆和厂甸以及宣武门内外小市上的旧书摊儿,遇到自己需要的好书,价格合宜,手头又有钱,便立即买下来。但当时的穷学生和后来的穷助教,更多的时候仅是爱不释手的翻阅“以解馋涎”,因为那令人咋舌的价目,常使父亲的购买热忱 Not far from the Xuanwumen, the second intersection of the westbound Tathagata Bridge alley. Into the wisdom of the bridge, an alley to the south is the school headlines. Halfway down the headlines, you will see two tall tree Acacia trees flew out of the courtyard of the gray walls, green leaves reveal the pink tulip flowers, exudes a touch of floral fragrance, so that the half Hutong are refreshing. That green courtyard is my father - Mr. Wu Xiaoling’s former residence. His book “double-boarded bookstore” will be named in the hospital that two acacia trees. As early as the mid-1930s, when his father was studying Peking University, he started to buy books. He visited old book stalls in the bookshops and factory buildings of Xuanwumen and Xuanwumen, met his own good books at reasonable prices, Have money on hand, they immediately bought it. But poor students at that time and later poorer assistants, more often than not, just read “solute salvation”, because that staggering price, often make his father’s enthusiasm for the purchase