There is no fixed theory with regard to the family system, the Shih-wu or the neighbor union system and the Li _??_ system of Chin and Han. Instead, there are 3 different views to each of the systems as shown below. 1. Family System, a. Small family theory (family composed of man & wife and their children), b. San-tsu _??__??_ system theory (During the parents are alive, the brothers live together and share properties.), c. Hsiao-tsung _??__??_ system theory (The brothers live and share properties together throughout their lives.), 2. Shih-wu or Neighbor Union System, a. 5 families=1 unit theory, b. 5 families=l unit and 10 families=1 unit theory, c. 10 families=1 unit theory, 3. Li System, a. 25 families=1 Li theory, b. 100 families=1 Li theory, c. no fixed number theory.The theory of 5 families=1 Lin _??_ and 5 Lin's=1 Li is observed in Chouli _??__??_ as well as in Shihming _??__??_ and there is no doubt as to the existence of such a view in Han period. Judging from the above, _??__??__??_ in the quotation _??__??__??__??_, _??__??__??__??_, _??__??__??__??__??__??_ from Shihming means that the circumference of the square is 1 Li and does not mean that the area has a radius of 300 pu. Suppose the ratio of sides of a rectangle is 1:3, 1 Li would be 37.5 pu × 112.5 pu=4, 218.75 square pu. When divided by 25, you get 168.75 square pu=349.92 square meters per family which is considered proper and reasonable.This, in deed, does not coincide with _??__??__??__??_ in Mengtzu _??__??_ since it would, then, be 1, 036.8 square meters to a family. According to ching tien, _??__??_ System, however, 1 Wu _??_ is composed of 3 Fu's _??_, each of which was given an arable land of 100 old Mu _??_. Then if 5 old Mu is the housing lot for 1 Wu composed of 3 Fu's, the housing lot per Fu would be 345.6 square meters which nearly coincides with the previous figure. Thus, 5 families=l Lin, like 3 Fu=1 Wu, may be explained as 5 small families living in one same housing lot making up 1 Wu or 1 Lin. This is the San-tsu Group of a father, sons and brothers or of similar kinship. Consequently, 25 families=1 Li means 5 San-tsu groups and is therefore a group of kinship. In each Li, there was its head Fu lao _??__??_ and also a She _??_.Then, how should we explain 100 families=l Li? According to the Ch'ien-mo System, 1 Mo=100 houses=l Li. This is made up of 4 old Li's. In other words, a new Li was composed of 4 parts which were separated by a Hsiang _??_ and a partition in the center of Li. Li gate was called Lu _??_ and gate at partition Yen _??_.Shih of Shih-wu was a set of 2 Wu's facing each other with Hsiang in middle. Accordingly, Shih was a non-kinship group. As the result, San-tsu groups received interference from outside in internal affairs and the old Li order or the order based on Fu-lao began to dissolve.
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