经、史、子、集四部颜色依春、夏、秋、冬四季而定，分别是绿色、红色、白色（或浅蓝色）、灰黑色。
Following the symbol colors of four seasons, Spring, Summer, Autumn and Winter, book covers of the Four Divisions were respectively printed green, red, white (or light blue) and dark grey.
经、史、子、集四部颜色依春、夏、秋、冬四季而定，分别是绿色、红色、白色（或浅蓝色）、灰黑色。
The colors of classics, history, philosophy and belles-lettres were selected according to spring, summer, autumn and winter seasons, which were green, red, white or light blue and grayish black.
药用部分：根、叶、花、果及五倍子均供药用，夏秋采收。
Parts being used in medicine: roots, leaves, flowers, fruit and wu bei zi. They are collected in summer and fall.
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