@article{oai:minpaku.repo.nii.ac.jp:00004608,
 author = {松山, 利夫 and Matsuyama, Toshio},
 issue = {3},
 journal = {国立民族学博物館研究報告, Bulletin of the National Museum of Ethnology},
 month = {Oct},
 note = {Nut-bearing trees are common in the Japanese islands. 
In Japan there are two main types of forest; deciduous forests in the
north and east and evergreen forests in south and west.
Such nut-bearing trees as Lepidobalanus are abundant in the deciduous
forests, while Cyclobalanopsitsh rive in the evergreen forest.
Buckeye (Aesculus trubinata) is usually found in the wet valleys of
eastern Japan.
In traditional villages in the mountainous regions of Japan,
these kinds of nuts are used as an important staple food in the form
of porridge and dumplings.
The acorn industry however involves a crucial technical process
to remove the bitter tannic acid before the nut is palatable.
In this report various processes for removing the bitter acid from the
nuts are discussed and a comparison is made of the proccesses used
for the nuts Lepidobalanus,C yclobalanopsiasn d Aesculus.
This information has been collected by the author who has
investigated 20 cases of buckeye and 9 cases of acorn in various parts
of Japan since 1974. He has concluded that there are two main
types of acid removing process. One is the "heating process"
which is invariably used in the case of buckeye and the acorns of
Lepidobaranus. In this heating process, there are two sub-types;
"heating" and "heating plus leaching".
Another type of process is the "pure leaching" process which is used
only in the case of the acorns of Cyclobalanopsis. The reason why there are two types of acid removing process is due to the amount of
acid in the nuts; it is high in buckeye and the acorns of Lepidobaranus
but low in those of Cyclobalanopsis.
The distribution of these two types of process coincides with
the main forest types of Japan. (See fig 5).},
 pages = {498--540},
 title = {野生堅果類，とくにトチノミとドングリ類のアク抜き技術とその分布},
 volume = {2},
 year = {1977},
 yomi = {マツヤマ, トシオ}
}