赵大爷看着他认真的样子，越讲越细致，又说起了采药的规矩：“还有，咱们采药，得守规矩，不能赶尽杀绝。挖带根的药，要挖大留小，看着刚长出来的小苗，绝对不能挖，不然今年挖干净了，明年就没了；开花的药不挖，带籽的药，采完了要把籽撒回土里，给它留个种；花叶类的药，要趁刚开花的时候采，那时候药效最足；果实类的，必须等熟透了再摘，不然药性不够，用了也白用。”
他顿了顿，又补充道：“采回来的药也不是直接就能用，怎么晒、怎么切、怎么炮制，都有门道。比如柴胡要去净须根，阴干才行，太阳暴晒会散了药性；苍术必须用麸皮炒过，才能去掉燥性，不伤脾胃；还有附子、川乌这些带毒性的药，必须炮制到位，不然会出人命，这些我后面都一点点教你。”
周牧云听得全神贯注，手里的本子写得满满当当，连赵大爷随口提的进山防蛇、迷路了怎么靠树木年轮、太阳方位辨方向的小技巧，都一字不落地记了下来。他心里清楚，这些都是赵大爷在山里走了十几年，用经验甚至教训换回来的真东西，比医书上写的更实用、更贴合村里的情况。
就这么你一言我一语，讲的人耐心细致，听的人全神贯注，等把进山采药的流程、路线、规矩、技巧全讲完，窗外的太阳已经落到了山后头，天色渐渐暗了下来。
周牧云合上写得满满的本子，对着赵大爷恭恭敬敬地说：“赵大爷，谢谢您，您讲的这些，比我在医书上看的实用多了，我都记下来了。正好明天没什么事，我想按着您说的路线，进山去看看，认认地方，也对照着认认药，熟悉熟悉环境。”
“行，去看看也好，耳听为虚，眼见为实嘛。”赵大爷点了点头，随即又皱起眉，反复叮嘱，“不过你可千万要小心，就按着我给你画的路线走，别往深山里闯，那些地方我都很少去，路险，还有野兽。我要是年轻十岁，肯定亲自带你进山走一趟，可现在年纪大了，腿脚不利索，爬不动山了，只能你自己去。”
“您放心赵大爷，我肯定不往深处走，就去您说的那几处坡地、山坳看看，认认药就回来，绝不贪多。”周牧云连忙应声。
“那也行。”赵大爷松了口气，笑着说，“这几条路线，都是我走了十几年的，都是缓坡，没有什么悬崖峭壁，也很少有野兽出没，基本没什么危险。你记着，早上早点去，下午三点之前必须往山下走，要是遇上什么不对劲的，别犹豫，立马往回跑，安全最重要，药采多采少都没关系。”
“哎，我都记住了赵大爷，您放心，我肯定注意安全。”周牧云一一应下。
眼看天彻底黑了，周牧云跟赵大爷道了别，揣着写得满满的本子还有进山的工具，往自家小院走。
回到自家小院，周牧云反手锁好院门，先拉上了窗帘，隔绝了外面的视线。他跟赵大爷说好了明天白天进山认药，可心里早就另有打算——先去上次的那个动物聚集地。
他先从空间里舀出雪白的精白面，和了面发上，灶膛里添了柴火，蒸了满满一锅白面馒头。馒头出锅后，他没敢多留，趁着热气全收进了随身空间里——空间里时间是静止的，馒头放进去多久，拿出来都是温热暄软的，完全不用担心放凉变硬。接着他又把进山的家伙事一一柴刀、药锄、火石火绒、装满热水的军用水壶，全都收进了空间，一切收拾妥当，就坐在炕沿上，静静等着天黑透。
窗外的天色一点点沉了下去，村里的灯火一盏接一盏地熄灭，最后只剩下零星的狗叫声，整个复兴村都陷入了沉睡。周牧云起身，顺着后山那条人迹罕至的羊肠小路，一头扎进了漆黑的山林里。
今晚的月色正好，一轮圆月挂在墨蓝色的天上，清冽的月光透过层层叠叠的树冠，在铺满落叶的山路上投下斑驳的光影。夜里的山路比白天难走了不止一倍，路边全是横生的灌木枝桠，脚下时不时就会踩到松动的碎石，稍不注意就会崴脚滑下坡。可周牧云身负暗劲修为，脚下踩着八步赶蝉的轻功步点，身形轻盈又稳健，哪怕是漆黑的夜里，也能精准避开路上的障碍，脚步落地轻得几乎没有声响，只有风吹过树叶的哗哗声，伴着他一路往深山里去。
饶是他修为扎实，不把这点山路放在眼里，也足足走了三个小时，才终于抵达了上次来过的那处山坳水潭。停下脚步的时候，他气息平稳，连额头的汗都没出，这点路程对他来说根本算不上累，只是这大半夜的，孤身一人站在荒无人烟的深山里，四周只有风声和远处偶尔传来的兽吼，月光把树影拉得像张牙舞爪的怪物，饶是他胆子再大，心里也难免生出几分空落落的异样感。
水潭在月光下泛着粼粼的波光，水面平静无波，夜里气温低，早就没有动物来这里喝水了。周牧云走到潭边，低头看向岸边湿润的泥地，瞬间就看清了上面密密麻麻的脚印——最大的是野猪的蹄印，两个尖蹄印深陷在泥里，尺寸足有巴掌大，一看就是体型不小的成年野猪，脚印还带着新鲜的湿泥，显然傍晚时分还来过这里喝水；旁边还有狍子、野兔的小巧蹄印，三三两两的，还有几串狐狸的爪印，甚至在泥地边缘，还看到了几枚狼的爪印，只是痕迹已经有些干了，应该是前几天留下的。
周牧云蹲下身，指尖轻轻碰了碰新鲜的野猪蹄印，心里了然——天亮的时候，肯定会有成群的动物来这里喝水，正是下手的好时机。
既然要等天亮，也没必要在水潭边干等着，周牧云转身在附近找了个背风的山坳，三面都是岩石，能挡住山风，地势也高，能看清周围的动静。他挥起柴刀，砍了些干透的松树枝和枯木，又找了些干草引火，点燃了火堆，橘红色的火苗腾地一下窜了起来，驱散了夜里的寒气，也把周围的黑暗逼退了几分，连虫蛇都不敢靠近了。
他靠着岩石坐下，从空间里拿出两个还冒着热气的白面馒头，就着军用水壶里的热水，慢悠悠地吃了起来。暄软的馒头带着麦香，一口下去，胃里瞬间就暖烘烘的，走了三个小时山路的那点乏劲，也瞬间散了个干净。
吃完饭，周牧云往火堆里添了两根粗柴，让火能烧得久一点，然后掏出烟盒，抽出一支烟点燃，深吸了一口。淡白的烟雾在火光里散开，他靠在冰凉的岩石上，目光落在跳动的火苗上，心里默默盘算着：明天早上天一亮，动物来喝水的时候，优先搞一头野猪，最好是体型大一点的。
夜里的山林格外安静，只有火堆里木柴燃烧的噼啪声，和远处偶尔传来的几声兽吼。周牧云夹着烟，耳朵却时刻留意着周围的动静，暗劲修为让他的耳力远超常人，几十米之内的风吹草动，都逃不过他的耳朵。他就这么守着火堆，眯了起来，等着清晨来水潭边饮水的猎物。
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