Type, in Chemistry, a chemical compound which represents the composition and structure of many more complex compounds; especially Gerhardt's four types—hydrochloric acid (HCl), water (H2O), ammonia (NH3), and marsh-gas (CH4).
Type
Chambers's Encyclopaedia, Volume 10: Swastika to Zyrianovsk and Index, p. 348
Source scan(s): p. 0369