Tartaric and citric acid are well known to exist naturally in various fruits, and have proved themselves to be thoroughly wholesome, by the enormous quantity which has been consumed for years past; not a single case of injury arising from the use of either of them has been traced. What would have been the result had mineral acids been used is alarming to contemplate. Mineral acids - sulphuric, phosphoric, hydrochloric, nitric, etc. - when taken internally by healthy persons for any length of time, produce a derangement of the internal and digestive functions, and when they are consumed by persons suffering from certain diseases, they are positively injurious.