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4. Inorganic products are arranged according to their fundamental elementary constituents, following the classification of the chemical elements given in Roscoe and Schorlemmer's "Treatise on Chemistry."

In each of these four divisions, under each natural order or elementary title are brought together the drugs of that order and each drug is represented in its various natural and commercial varieties and its important preparations.

The collection as actually [[strikethrough]]re [[/strikethrough]]presented for study begins with a series designed to illustrate the forms in which medicinal substances appear in commerce or are prepared for administration by the pharmacist. In this series the effort has been made to present representative specimens of each class, and what is considered to be of greaterimportance, to attach thereto labels giving con[[strikethrough]]s[[/strikethrough]]^[[c]]ise and accurate definitions of the classes.

Following this exhibit of medicinal forms is arranged the general collection according to the classification given above beginning with animal products in their zoological order, succeeded by vegetable products in botanical order, etc. The succession of specimens is from left to right and top to bottom of each section of ^[[the]] exhibition cases in which the collection is presented. Each order and its limits are indicated by symbol and name on the case.

Succeeding the general collection is an exhibit of some of themost popular mineral waters. Eachof these is shown in the quantity of 10 litres and with it each of its saline constituents, in the exact weight which analysis has shown to be present in that volume of