十八、鹅毛笔与筹算
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陈操之鼓励道：“小婵姐姐很聪明的，你别急，明日我另外制一支笔给你试试看。”
次日，陈操之让来震去拔三根白鹅的大翅羽毛来，将羽管内的油脂除去，晾干，让羽管变得坚韧，这鹅毛笔就算是制成了，陈操之执鹅毛笔在砚上蘸了墨水，在麻纸上写字——
小婵、青枝、宗之和润儿都在边上看，但见这鹅毛笔写出来的字笔致纤细匀整，虽无提顿藏锋之美，但好在方便易学。
陈操之移坐到一边，对小婵道：“小婵姐姐，你来试一试，以后就用这个记账，又快又方便。”便教小婵握笔姿势，让她学着写。
小婵又紧张又快活，执鹅毛笔的手微微发抖，鹅毛笔管捏得太紧，墨水一滴滴落在了麻纸上，青枝和润儿都笑，小婵瞪了她二人一眼，面对陈操之时，脸就红了，说道：“我真是笨死了，操之小郎君不要笑我。”
陈操之耐心地教小婵，手把手的教，可怜的小婵杏脸通红，脑袋晕晕乎乎的，虽然心里对自己说要认真学、要认真学，偏偏聚不起心神，操之小郎君说的话她都听得清清楚楚，可就是心慌意乱、领悟不了——
润儿在一边瞧得好着急，说道：“小婵姐姐，让润儿写几个字试一试。”接过鹅毛笔，很顺畅地就用写了八个字——“呦呦鹿鸣食野之苹”，说道：“很好写啊，小婵姐姐。”
小婵难为情道：“润儿小娘子聪明，我笨。”
陈操之也发觉自己不大适合教小婵，便道：“润儿，你把掌握的诀窍向小婵姐姐说说。”
润儿便把方才丑叔说的又对小婵说了一遍，怪哉，这回小婵就很快掌握了执笔的姿势和捏笔的轻重，写起字来也方方正正了，润儿这个小精灵冲陈操之眨眨眼，表示她明白这是为什么？
小婵也觉得自己单独与操之小郎君在一起会变得笨拙，便请润儿小娘子与她一起学筹算，润儿很乐意，眼望丑叔。
陈操之道：“那就一起学吧，润儿领悟得快可以教一下小婵姐姐。”
陈操之这么说，小婵并无丝毫被轻视的感觉，因为润儿小娘子的聪明是出了名的，能者为师嘛。
宗之道：“丑叔，我也要学。”
陈操之道：“宗之和润儿就不要学用鹅毛笔写字了，还是用毛笔，鹅毛笔是记账用的，我教你们三个筹算。”便先将与一至十相对应的阿拉伯数字教给他们，再教他们简单的四则运算，主要是教他们列算术竖式，润儿和宗之领导能力极强，小婵也不错，五天时间就基本掌握了四则运算的基本法则，乘法口诀也背熟了。
陈操之出了一道题“今有黄金一斤，直钱一十万，问一两直钱几何？”
小婵、宗之、润儿各列竖式，三人全部答对：一两黄金值六千二百五十钱。
宗之、润儿虽然学会了，但还不知道这个筹算能派上什么用场，小婵最快活，下月跟着来福去收麦租时就轻松了，自去把以前的帐簿取来一一用新方法运算，果然又快又准。
陈母李氏也来看两个孙儿和小婵学筹算，摇着头笑道：“丑儿这筹算术哪里学来的啊，娘可从来不知道你还学过这个？”
陈操之便推说是在初阳台道院看到的一本古算经，从那里学得的。
五月二十六日傍晚，冉盛风尘仆仆地回来了，冉盛与来德是本月十一去的吴郡，前后才半月，怎么就他一个人回来了？
冉盛脸膛晒得黑里透红，长途赶路归来，丝毫没有疲惫之感，依旧精神如虎，接过荆奴端来的茶水咕嘟咕嘟喝了一气，然后向陈操之禀道：“小郎君，我和来德哥起早摸黑的赶路，每日步行一百里，第七天就赶到了吴郡，到太守府求见陆太守，呈上小郎君的书信，陆太守说名医杨泉已于半月前回扬州了，当即写了一贴，派陆府管事与来德哥一起去扬州请名医杨泉，因扬州来回要费些时日，所以陆太守就让我先回来告知小郎君一声——小郎君，这是陆太守的回书。”
陈操之看了陆纳的回信，心里甚是感激，想到陆葳蕤，心里又有些不安，问冉盛可曾见到陆氏小娘子？冉盛道：“未曾见到，可能是在华亭吧，可惜我这次没走华亭那条路，不然应去告知陆氏小娘子一声，要不我明天再往华亭一趟？”
陈操之忙道：“不必不必，小盛辛苦了，好生歇着去吧。”
陈操之见母亲这些日子身体还好，虽然照样睡眠浅、容易心悸，但并未有日趋严重的苗头，也就不急，静等杨泉到来，支愍度大师说得对，杨泉是专门行医的，见多识广，让杨泉来为母亲诊治也可与支愍度大师诊断的结果相印证。
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