温者，温热也；瘟者，瘟疫也；其音同而其病实属不同。又可《瘟疫论》中，谓后人省 加 为瘟，
瘟即温也。鞠通《温病条辨》，统风温、温热、温疫、温毒、冬温为一例。两家皆以温瘟为一病。殊不知温
热本四时之常气，瘟疫乃天地之厉气，岂可同年而语哉！夫四时有温热，非瘟疫之可比。如春令之春温、
风温，夏令之温病、热病，长夏之暑温，夏末秋初之湿温，冬令之冬温，以上诸温，是书皆已备述，可弗
重赘。而鞠通先生之书，其实为治诸温病而设也。至于瘟疫之病，自唐宋以来，皆未详细辨论。迨至明末
年间，正值凶荒交迫，处处瘟疫，惨不堪言，吴又可先生所以着《瘟疫论》一书。所谓邪从口鼻而入，
则其所客，内不在脏腑，外不在经络，舍于伏脊之内，去表不远，附近于胃，乃表里之分界，是为半表半里，
即《针经》所谓横连膜原是也。其初起先憎寒而后发热，日后但热而无憎寒。初得之二、三日，其脉不浮不沉
而数，头痛身疼，昼夜发热，日晡益甚者，宜达原饮治之。咸丰八载，至同治纪元，吾衢大兵之后，继以凶
年，沿门合境，尽患瘟疫。其时丰父子延医用方，皆宗又可之法也，更有头面颈项，颊腮并肿者，为大头瘟。
发块如瘤，遍身流走者，为疙瘩瘟。胸高胁起，呕汁如血者，为瓜瓤瘟。喉痛颈大，寒热便秘者，为虾蟆瘟
（一名捻颈瘟）。两腮肿胀，憎寒恶热者，为鸬 瘟。遍身紫块，发出霉疮者，为杨梅
瘟。小儿邪郁皮肤，结成大小青紫斑点者，为葡萄瘟，此皆瘟
疫之证，与温病因时之证之药，相去径庭，决不能温、瘟混同而论也。因忆又可着书，正崇祯离乱之凶年；
鞠通立论，际干嘉升平之盛世；一为瘟疫，一为温热，时不同而病亦异。由是观之，温病之书，不能治瘟疫；
瘟疫之书，不能治温病。故凡春温、风温、温病、暑温、湿温、冬温，字必从 。瘟疫、大头、疙瘩、瓜瓤、
虾蟆、鸬 、杨梅、葡萄等瘟，字又从 。温、瘟两字，判然不同，而况病乎！知我者，幸弗以丰言为河汉也。
Wen (Warmth) refers to warm-heat diseases; Wen (Plague) refers to epidemic plague. Although their pronunciations are identical, the diseases they denote are fundamentally different. In Wu Keyang's *Treatise on Pestilence* (*Wenyi Lun*), it is stated that later generations abbreviated "Yi" (epidemic) and added a radical to form "Wen," implying that Wen is equivalent to Wen. Wu Jutong's *Systematic Differentiation of Warm Diseases* (*Wenbing Tiaobian*) categorizes Wind-Warmth, Warmth, Warm Epidemic, Warm Toxin, and Winter-Warmth into a single category. Both schools treat Warmth and Plague as the same disease. Little do they realize that Warm-Heat is the normal seasonal qi of the four seasons, whereas Plague is the malignant qi of heaven and earth. How can they be compared? The presence of warm-heat conditions in the four seasons cannot be equated with plague. For instance, Spring-Warmth and Wind-Warmth in spring; Warm Disease and Heat Disease in summer; Summer-Warmth in late summer; Damp-Warmth in late summer and early autumn; and Winter-Warmth in winter. All these warmth-related diseases have been comprehensively discussed in this book, so there is no need for redundant elaboration here. Mr. Wu Jutong’s work was actually designed for treating various warmth diseases. As for plague diseases, detailed discussions were lacking from the Tang and Song dynasties until the late Ming period. During the late Ming, amidst severe famine and distress, plagues broke out everywhere, resulting in unbearable misery. It was then that Mr. Wu Keyang wrote his *Treatise on Pestilence*. He stated that pathogenic factors enter through the mouth and nose, residing neither inside the Zang-Fu organs nor outside in the meridians, but lodging in the area behind the spine, close to the stomach, which constitutes the boundary between exterior and interior, known as the Half-Exterior Half-Interior stage. This corresponds to what the *Classic of Acupuncture* (*Zhenjing*) calls the "membrane source" (Moyuan). Initially, patients experience aversion to cold followed by fever; after a few days, only fever remains without aversion to cold. In the first two or three days of onset, the pulse is neither floating nor deep but rapid. Symptoms include headache, body ache, continuous fever day and night, worsening at dusk. In such cases, *Daren Yin* (Reach the Original Decoction) should be used. From the 8th year of Xianfeng to the beginning of the Tongzhi era, following military conflicts in our Quzhou region and subsequent years of famine, entire households and communities suffered from plague. At that time, my father and I practiced medicine using prescriptions based on Wu Keyang’s methods. Additionally, there were cases of Head-Giant Plague (*Datou Wen*), characterized by swelling of the head, face, neck, cheeks, and jaws; Lump Plague (*Geda Wen*), marked by tumor-like lumps moving throughout the body; Melon-Rind Plague (*Guanang Wen*), featuring high chest, distended flanks, and vomiting bloody fluid; Toad Plague (*Xiam Wen*, also called Neck-Twisting Plague), with sore throat, swollen neck, alternating chills and fever, and constipation; Cormorant Plague (*Lu E Wen*), presenting with swollen cheeks, aversion to cold, and fear of heat; Yangmei Plague (*Yangmei Wen*), showing purple patches all over the body resembling plum pox; and Grape Plague (*Putao Wen*), where children develop blue-purple spots of varying sizes due to pathogenic stagnation in the skin. These are all manifestations of plague, which differ vastly from the seasonal syndromes and treatments of warmth diseases. They absolutely cannot be conflated. Recalling that Wu Keyang wrote his book during the chaotic and disastrous reign of Chongzhen, while Wu Jutong formulated his theories during the prosperous reigns of Qianlong and Jiaqing—one addressing plague, the other warmth—the timing differed, and thus the diseases differed. Therefore, books on warmth diseases cannot treat plague, and books on plague cannot treat warmth. Hence, terms like Spring-Warmth, Wind-Warmth, Warm Disease, Summer-Warmth, Damp-Warmth, and Winter-Warmth are distinguished from Plague, Head-Giant Plague, Lump Plague, Melon-Rind Plague, Toad Plague, Cormorant Plague, Yangmei Plague, and Grape Plague. The characters "Wen" (Warmth) and "Wen" (Plague) are distinctly different, let alone the diseases themselves. Those who understand me, please do not dismiss my words as nonsense.