The imperial court of the Sui practises a policy to engage in households expansion,a policy with the tax reduction as its core,and the policy causes large numbers of the privately sheltered households to make their way into the state household register,thus creating a wonder of having the number of households of the country doubled and grains and goods kept in storehouses increa.

This article introduces a knitting skill——no-knitting,which could be used to part-substitute our normal method of cust off in shapped knitting.

SHEN Kuo: "Meng Xi Bi Tan "and his scientific thoughts;

Shen Kuo s Achievements in Natural Science and Scien-tific Thinkings;

Shen Kuo and His Mongxi Bitan (Dream Pool Essays);