4 8 Of ClaJJification. havej ftriflly fpeaking, the fame proportion of ingredients. Traps or bafalts, and zeolytes, vary confiderably. 4°. Any earth which forms lefs than ^ of a , compound is almofl: always of little importance. 5°. Water forms an important part of any compound when lt exceeds -^ T of the whole. 6®. Calces of iron influence in fome meafure the properties of a compound when they exceed y T of the whole, If they are themfelves mag- netic, they communicate that property to Com pounds of which they form, above Species are further divifible from fome parti- cular points of agreement into families, or claffes and families j fometimes it is necefi'ary to form diftinctions where fpecific charadters are not de- cided; in which cafe I diftribute the claffes into tribes and families, as will be feen in the lequel. The minuter diverfifications are callcd varieties. The term fpeämen correfponds with that of indi vidual in the animal kingdom.