This paper deals with parts of words used in the discriptions of drug minerals of ``Donguebogam``. The words are classified into eight parts of speech which are related mostly to the oriental medicinal and mineralogical terms. For examples, a noun is the name of an organ of the human body(such as 筋骨)， a disease(such as ?疸)， a drug mineral (such as 石膏) or a locality(such as 忠州). An adjective describes a noun (such as 靑 in 靑焰 or 熱 in 性大熱). A verb describes a reaction of curing or sterilizing (such as 療 in 療折傷 or 殺 in 殺疥癬?). Gypsum (石膏, CaSO4·2H2O) has been known to have an antifebrile effect in the ancient oriental medicine but the effect was not clearly proved by the modern clinical demonstration leaving a controversial problem. As an effort to solve this problem a geochemical discussion on the enthalpy was carried out because no enthalpy has been considered so far in the modern clinical tests. Therefore, it is necessary to consider the enthalpy as a factor to influence the antifebrile effect in the clinical test and in this paper the enthalpy of gypsum is dealt. When gypsum is taken internally it may dissolve in water into Ca2+ + SO4(2-) +2H(2)O to reach towards an equilibrium absorbing heat (endothermic reaction) from its surrounding but is precipitated from its oversaturated solution evolving heat(exothermic reaction).