第一千一百二十五章 律吕
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徐煜低着头走了进去，见房内点着几盏灯，只有徐庆堂一个人坐在太师椅上。徐煜遂请了安，感觉祖父的脸色看上去很和蔼，于是胆气为之一壮。
“坐吧。”徐庆堂问道：“你这几天没上学去么？”
徐煜顿时红了脸不敢回话，徐庆堂说道：“果然逃课了。煜儿，你的文字不知道荒疏成什么样儿了。你知道本月的月课，陆师爷看的卷子，把你丢出五名外去了，真是臊死人！你弟弟倒考了第二。你怎么说？”
徐煜低声道：“月课那天，适因我娘有点不舒服来着，所以孩儿草草写完，进来伺候。像以前，孩儿虽天天玩，却没有一刻儿敢忘记书本，每当做文章的时候，任凭外头怎么热闹，我拿起笔就能收住心。最近几年，孩儿被我爹教导。要多读新学，留意兵书，所以四书五经就有些疏远了。”
“罢了。”徐庆堂无奈摆摆手，“你打小就不怕我，我也奈何不了你。你现在去西府见你三爷爷，他也有话说。”
徐煜嘻嘻一笑，撒腿跑了出来，等见到了徐增福，也是问这事。
徐煜原话说了一遍。又说道：“孙侄儿对文字有些自信，每次月课都是三爷爷面试的，每次也把孩儿的卷子取在上面，终不成三爷爷信不过我吗？”
徐增福被他给呕笑了。说道：“我知道你受你老子熏陶，不把正项文字放在心上，每次皆临时急几句出来还看得过去而已。人人都说你在杂学上用了心思，有自信过吗？”
徐煜说道：“说自信。孙侄儿不敢讲这话。科学方面，倒是外人称许的多，诋毁的少。唯有词曲上的音律，我很有自信。”
“哦！”徐增福立时被他给带到沟里去了，原来徐增福喜欢音律，故此徐煜投其所好。
“那我问你，律吕二字有分别么？”
徐煜笑道：“每次您老讲音律时都由此开端，孙侄儿焉敢忘记？阳者为律，阴者为吕。律声清，吕声浊。人但说十二律，不知道却是六吕六律并为十二的。如黄钟、太簇、姑洗、蕤宾、夷则、无射为六律属阳；大吕、夹钟、仲吕、林钟、南吕、应钟为六吕属阴。阴吕阳律必相间而成声，黄钟元间大吕，太簇二间夹钟，姑洗三间仲吕，蕤宾四间林钟，夷则五间南吕，无射六间应钟，这便是律吕合声之说。”
“不错。”徐增福很是高兴，“看来最近你涉猎了。哈哈我知道了，一定是为了在姐姐妹妹面前挣面子吧？”
“嘿嘿！”徐煜不好意思的一笑。
徐增福笑问道：“那九宫是哪九宫？”
“九宫只用七宫。”徐煜极有信心的又详细说道：“即黄钟宫、仙吕宫、正宫、高宫、南吕宫、中吕宫、道宫。”
“不错。”徐增福问道：“五音乃宫商角徵羽，六律六吕各有所属，是哪几个？再变宫变徵是哪一宫所生？”
徐煜不假思索的答道：“这个需明白黄钟大吕属宫；太簇彝钟属商；姑洗仲吕属角；培宾闰徵、林钟夷则属徵；南吕无射属羽；应钟属闰宫。这便是律吕隔八相生之说。”
“好！老夫忘了你娘在这上面的造诣远超于我，有其母必有其子。”徐增福赞赏的点点头，又问道：“天干十数为十母，五音各有所属各有所生，是怎注解的？”
原来自从朱明之等人住了过来后，徐煜有感于自己没什么拿得出手的知识，于是最近求母亲教导，而沐凝雪堪称音律大家，既然宝贝儿子感兴趣，断没有不倾囊相授的道理。并且徐煜在古音乐方面确实极有天赋，继承了母亲的优点。
“宫居中央属士为戊己，君之象为信，徵所生其声浊，生数五，成数十；商居西方属金为庚辛，臣之象为义宫所生，生数四，成数九；角属木居东方为甲乙，民之象为仁羽所生，其声半清半浊，生数三，成数八；
徵属火，居南方为丙丁，事之象为礼，角所生，其声次清，生数二，成数七；羽属水居北方为壬癸，物之象为智商所生，其声最清，生数一，成数六，声生于日，天干十数为十母，便是这个解说。”
侃侃而谈的徐煜索性继续说道：“还有律生于辰，地支十二为子，二十四候为妇之说。则是：黄钟为子，应十一月大雪至冬至节气；大吕为丑，十二月小寒至大寒；太簇为寅，正月立春至雨水；夹断为卯，二月惊蛰至春分；姑息为辰，三月清明至谷雨；仲吕为巳，四月立夏至小满；蕤宾为午，五月芒种至夏至；林钟为未，六月小暑至大暑；夷则为申，七月立秋至处暑；南吕为酉，八月白露至秋分；无射为戍，九月寒露至霜降；应钟为亥，十月立冬至小雪。”
徐增福听了甚是高兴，想自己还达不到这地步呢，于是忍不住问道：“律吕四犯，是怎样一个犯法？”
徐煜笑道：“四犯是四个名式，即正犯、侧犯、偏犯、旁犯。其实不止四犯，还有归宫，俗称为尾犯、倒犯的。”
谁知徐增福摇头道：“我不问名式，你把每样一个犯法详细讲来。”
“以宫犯宫为正犯。”说到这儿，徐煜皱起了眉。
徐增福追问道：“怎么宫能犯宫？”
徐煜回忆半响，才说道：“黄钟犯大吕便是以宫犯宫，以宫犯商为侧犯；以宫犯羽为偏犯；以宫犯角为旁犯；以角犯宫为归宫，周而复始。”
“哈哈！”徐增福好不得意的笑道：“那你还没说仔细，可知四犯是总名，一宫皆有四犯？”
“对，我想起来了。”徐煜一拍大腿，说道：“把四犯细讲起来，原十二宫各有所犯。以十二宫照前律吕相间排去，如黄钟宫犯无射商为宫犯商，无射商犯夹钟羽为商犯羽，夹钟羽犯无射闰为羽犯角；无射闰犯黄钟宫为归宫。以此类推，干脆我写纸出来，三爷爷您便明白了。”
徐增福听得频频点头，赞叹道：“名师出高徒，凝雪果然乃不世出的大家！”
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