《哈佛中国史》的前三部即秦汉史、南北朝史、唐朝史，均由一人著述，因此，前三部哈佛史整体上内在脉络一气呵成，气韵相通，前后呼应，始终在中国的全程历史中，展现出断代史的存在位置、流变特征及后续影响，称得上是出于一人之手的体例一致的中国前史“三部曲”。

在《唐朝》篇中，指出了这是一个伟大的时代，称它“是最后一个强大的‘中华’王朝”，因为在唐朝之后的中国历史中，中国的北部始终难以逃脱被游牧民族所控制这一点即已经显示出唐朝的金瓯体系的宏阔博大，但同时也指出，唐朝的帝王血统里潜蕴着胡人的因子。这一点，在书中的字里行间时常跳出字面，提醒着读者的注意，正如书中所云：“虽然李氏家族宣称自己是灭亡的汉朝的真正继承者，但唐朝更多是5—6世纪统治中国北方的所谓夷狄或半夷狄王朝北魏、北周、北齐、隋的很多元素的结合。”（P38）而了解这种唐朝帝王血脉的胡人因子，对于了解唐朝的历史至关重要。

可以说，唐朝的建立是在近三百年的魏晋南北朝的分裂基础上横空出世的，五胡乱华的强大旋风，浩荡于北中国，打乱了既有的地理布局与人群分布，强大的势能，必须借助漫长的时间才能耗尽内在的惯性冲动。到了唐朝时代，“树欲静，风不止”，终其唐代，仍可以看到周边的所谓蛮夷势力对整个王朝的影响与波及，并形成了大唐盛世艳阳高照背后的巨大的日蚀阴影。正如书中所说，在唐朝的最后百年里，中国的北部近乎是独立在王朝控制范围之外，相对而言，南方尚受中央控制，可以说，即使是一统天下的唐朝，在隐性的状态下，也是处于一种分裂状态的。而这正构成了全书导言里归纳的唐朝的四个特征之一的重点：就是唐朝时代，中国的地理重点继续向南倾斜。可以说北方与西部的所谓蛮夷族群的压力，逼迫着唐朝政权不得不继续推进向南的步伐，尤其是“安史之乱”之后，“政府丧失了对黄河流域大部分地区的控制，导致长江流域成为帝国的经济中心与主要财源。”（P4），而这一特征，贯穿在秦汉、南北朝之前的历史流程中。哈佛这套中华帝国史里始终有一个重要的参数，就是借助于地理上的中国重心的位移来阐述历史的叙述扇面，它所带来的益处是双重的，一方面可以更清晰地解释中国历史的内部动力的问题，就像借助于火山岩熔的流动性，可以窥见地球内部的驱动之源，而另一方面，从接受者的角度来看，借助于地理的化繁为简的图解，可以把历史的脉络线路绘制得更加泾渭分明。

而书中，更是指出了唐代发生的体制上的重大嬗变，直接让唐朝具备了中国历史上重要转折点的里程碑意义。书中引述道：“日本历史学家内藤湖南主张从唐到宋的长期变革始于8世纪中叶，标志着中国从‘中古’到‘近世’的转变。”（P3）。这个重大的节点的转变，在“安史之乱”之后得到了显影与完成。当然，这种说法，即使在《哈佛中国史》这套书的内在体系中也有异样的表述。最为明显的是，在这套史书的后面一本“宋的转型”中，就把中国的历史转折点放在了宋代，认为“有些历史学家甚至把宋代称作开启现代性曙光的中国的‘文艺复兴’时代。”不管怎么说，唐代在制度上废弃了继承自汉朝的一系列制度，而这其中最为明显的就是“世家大族”的势力日益削弱，“大族们的统治是在10世纪初随着唐王朝自身的灭亡而结束的。”（P3）。在由陆威仪执笔的前三部哈佛史中，“世家大族”一直是书中加以重点讨论的一种强大的势力，这个势力，在魏晋时期达到了高潮，而之后一直趋于陨落，到了宋代已经丧失殆尽了。对世家大族的重视，正反映了这部历史书对影响政治权力中心的各种可能的兼顾程度。世家大族一度时期特别是魏晋南北朝时期成为与王权统治对抗的一种强大的力量，由谱牒传承的贵族身份，沿续了一种隐性的权力，寄托在话语权中，形成了难以想象的与王权的抗衡力量，而这种力量，经过南北朝时期翻天覆地的大动荡，而消灭了这种秩序型的话语力量，世家大族在中国历史中的干预与影响日渐消遁，而这正是在书中屡次对此加以申说的重要原因之一。

唐代的历史，在我们惯常的想象中已经极端演义化了，而这种演义，相当程度上被淫猥绯闻化。武则天与杨贵妃成了唐代最为知名的两个女人，围绕她们展开的无限想象，始终绕不开艳情与淫荡的怪圈。而这本哈佛史的可贵之处，就是对我们津津乐道的“妖艳化”唐朝的历史抱着绝对的弃绝的态度。在书中，毫不隐讳地指出，武则天那些今天被我们当作信史一遍遍演绎的传奇故事根本无法考证，而颇为有趣的是，在这里，对可以称着是哈佛史书暗中较量的对手《剑桥中国史》道出了或多或少的醋意，书中写道：“值得尊敬的《剑桥中国史》的，在指出历史记录的偏见后，仍然毫不怀疑地接受了武氏为嫁祸某个敌人而谋杀亲子，处死人之前先毁损其肢体，豢养大量面首，迷信且易于受巫术的操纵，以及很多其他此类诋毁。”（P32）。看起来，哈佛史准备为武则天平反了，但是接下来，显示的却是自己拥有历史资料的同样空白，“虽然不能证明其中哪些事件没有发生（如何证明一个否定的观点？），但历史学家也没有任何证据能让他们相信这些事是真的。不幸的是，这就意味着唐朝廷这段60年的历史将完全空白。”确证了历史的盲点，以此作为辩驳对手的底气，而既然大家都立足于“一无所有”基础上，那么，哈佛史的选择是执行一条“胜利者是不需要审判”的原则，由此作出结论：“为了生存，她的某些残酷做法是必要的。”使我们印象深刻的是，同一在论述秦始皇的残暴时，也用了辩解之语。而这种对历史的重新界定的崭新语境的撷取，正构成了这部哈佛史在行文上的特点，对于众多中国历史上的盲点与语义不详处，更多地是用“可能”、“或许”这样的语言来小心翼翼地求证出自己的观点，以尽力接近历史的本来面目，而这种看似模棱两可的叙述语式，正是西方人所著历史的一个非常显明的特点，就是历史叙述中，存在着一个视角，而视角的力量毕竟有限的，是无法通透地鸟瞰全程的，这反而可能因为的明确的视角的存在，而使我们对历史获得厚与薄的直接感知，也启发我们在这些深浅的反差叙述中而去进一步探讨“烛影斧声”。

一本哈佛唐代史，依然从地理环境入手，以帝王治国方略为脉线，突出抓住终唐一世都无法解决的藩镇问题，对大唐王朝的社会、经济、文化的各个方面都作了精到的叙事，能够让我们从整个中国历史的大脉络中去看清唐朝的自身特质，沉浸在断代史的细部，又对应整个中国历史长卷，使读者可以在大框架里去摸透小迷宫里的每一个转折与曲折，这应该是哈佛史立论与申说的成功之处吧。

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