Astanga Hrudaya
समग्रगुणसारेषु शक्त्युत्कर्षविवर्तिषु। व्यवहाराय मुख्यत्वाद्बह्वग्रग्रहणादपि॥१५॥
are important in day - to - day routine, applicable to majority of substances being considered first in scientific procedures. Hence, these 8 have been given importance.
english translation
samagraguNasAreSu zaktyutkarSavivartiSu। vyavahArAya mukhyatvAdbahvagragrahaNAdapi॥15॥
hk transliteration by Sanscript