Au 16^e siècle, it exista des manufactures du système féodal où l'on produisit des soieries, Bans la région entre des montagnes du Japon central. Des travailleurs de cettes manufactures n'étaient pas des ouvriers, mais des serfs; ils n'étaient pas des personnes qui appartenaient à la classe ouvrière. Donc, la plus value en cette manufacture était redevance de travail, c'est-è-dire redevance de terrain même.
Avec l'affranchissement de l'object de travail de terrain—la commercialisation des soles grèges ou des cocons qui sont textiles des soieries—, ainsi que avec l'émancipation des serfs de ses terrains—le changement d'état de serf à celui de ouvrier libre—, La manufacture du système féodal devint celle du système capitalistique. Cette phénomène se produisit depuis le milieu du 18^e siècle à la ville de Niryu où l'industrie se développait le mieux, Puis elle exerçait une influence sur les villes voisines.
Par conséquent, contrairement au sens commun de l'étude d'histoire économique, l'auteur considère la manufacture du système féodal comme mère de la manufacture capitalistique. Mais au milieu de 19^e siècle, cette évolution était interrompue ou se reculait une fois. (Néanmoins, au bout de 19^e siècle, ces manufacturers établirent des sociétés annonymes dont le but étaient de produire de l'hydro-électricité, et en profitant de vela, us mécanisèrent ses usines.)

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Coastal terraces developed along the coast of northern Rikuchu are classified into following 8 levels ; (1) Mizunashi Terraces (270 m.), (2) Hirono Terraces (220 m.), (3) Misaki Terraces (200 m.), (4) Samurai-hama Terraces (160 m.), (5) Mugyo Terraces (110 m.), (6) Uge Terraces (80 m.), (7) Taneichi Terraces (30 m.) and (8) Alluvial plains.
The highest terraces in this region are Mizunashi Terraces, whose surfaces are composed of marine beds more than 10 meters in thickness in the northern part of the region. Hirono Terraces and Misaki Terraces are both flat rocky abraded terraces covered with thin marine beds, more than several kilometers wide. The initial form of those terraces will be inferred as the terraces formed during a period of slow rise in the sea level.
Mugyo Terraces developed along the ria shoreline of Fuji Pay are composed of fluvial and marine beds more than 10 meters in thickness. Alluvial plains of comparatively large rivers also consist of marine and fluvial beds thicker than 20 meters. Judging from characteristics of the coastal terraces at these levels, the neighbourhood of Fuji Pay was deeply dissected and then submerged in relative.
Samurai-hama Terraces, Uge Terraces and Taneichi Terraces without characteristic features of rise in sea level or submergence are also rocky abraded terraces and will be considered as terraces formed during the upheaval period.
Relative changes in sea level in this region will be summarized as follows : After thedeposition of Neogene formation, submergence occured and consequently Mizunashi Terrace were formed. After the formation of Mizunashi Terraces, the region has risen generally. The cause of emergence was mainly crustal upheaval, but eustatic oscilation of sea level took place during emergence. During transgression due to eustatic rise of sea of sea level, Hirono Terraces Mugyo Terraces and Alluvial plains were formed. In the older Pleistocene (Hirono Period), since eustatic rise in sea level was slow, flat rocky abraded terraces were formed, but in later period (since Mugyo Period) embayments were formedat Fuji by rapid eustatic risesof sea level. Moreover, the formation of ria shorelines at Fuji in these periods represent remarkable dissection of the coastal region prior to transgressions.
Eustatic oscilations of sea levels has influenced the geomorphical development of the coast and amplitude of relative changes in sea level were greater during the later Plesistocene Period than during the previous periods.

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A mathematical model of slope development is summarized by the relation
_??_
where u: elevation, t: time, x: horrizontal distances, a: subdueing coefficient, b: recessional coefficient, c: denudational coefficient and f (x, t): arbitrary function of x and t, respectively. Effects of the coefficients are shown in figs. 1-(A), (B) and 2-(A).
In order to explain the structural reliefs, the spatial distribution of the rock-strength against erosion owing to geologic structure and lithology is introduced into the equation by putting each coefficient equal a function, in the broadest sence, of x, t and u. Two simple examples of this case are shown in fig. 5.
The effects of tectonic movements, for instance of faulting, are also introduced by the function f (x, t), which is, for many cases, considered to be separable into X (x) and T (t), where X (x) and T (t) are functions of x only and t only, respectively. An attempt to classify the types of T (t) has been made.
Generally speaking, provided the coefficients a, b and c are independent of u, the equation is linear and canbe solved easily. With suitable evaluation of the coefficients (as shown, for example, in fig. 4-(A)), this linear model can be used to supply a series of illustrations of humid cycle of erosion, especially of the cycle started from faulting.

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