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~Standard Solutions.~--In making these the salt is accurately weighed and transferred to a litre flask, or to the graduated cylinder, and dissolved. The method of dissolving it varies in special cases, and instructions for these will be found under the respective assays. Generally it is dissolved in a small quantity of liquid, and then diluted to the mark. For those substances that require the aid of heat, the solution is made in a pint flask, cooled, and transferred; after which the flask is well washed out. After dilution, the liquids in the measuring vessel must be thoroughly mixed by shaking. This is more easily and better done in the cylinder than in the litre flask. The solution is next transferred to a dry "Winchester" bottle and labelled. The label may be rendered permanent by waxing it.

When the assays are finished, it is the duty of the assistant to clean the apparatus (with reagents, if necessary), and to put the vessels in the place set apart for them. Flasks are best kept inverted on a rack, so that they may be dry and clean by the next morning. Berlin crucibles must be cleaned and ignited. The amount of apparatus employed should be as little as is feasible. The assay should be carried out as much as possible in the same flask. The bench must be clean, and altogether free from apparatus not in actual use. Crucibles and dishes in which weighings are made should be marked with numbers or letters; and their weights recorded, together with the date of weighing, in a small ledger, which is kept in the drawer of the balance. By this means a record of the "wear" of each piece of apparatus is obtained, and, what is more important, much weighing is saved, and increased confidence is gained. The weight of each piece of apparatus need not be taken daily. It will be seen from the record in the book and a knowledge of the use it has been put to how often a checking of the weight is necessary. The entries are made in black lead as follows:--

With such a mind, active as phosphorus, biting everything that came near into the form that suited it, how could Mrs. Cadwallader feel that the Miss Brookes and their matrimonial prospects were alien to her? especially as it had been the habit of years for her to scold Mr. Brooke with the friendliest frankness, and let him know in confidence that she thought him a poor creature. From the first arrival of the young ladies in Tipton she had prearranged Dorothea's marriage with Sir James, and if it had taken place would have been quite sure that it was her doing: that it should not take place after she had preconceived it, caused her an irritation which every thinker will sympathize with. She was the diplomatist of Tipton and Freshitt, and for anything to happen in spite of her was an offensive irregularity. As to freaks like this of Miss Brooke's, Mrs. Cadwallader had no patience with them, and now saw that her opinion of this girl had been infected with some of her husband's weak charitableness: those Methodistical whims, that air of being more religious than the rector and curate together, came from a deeper and more constitutional disease than she had been willing to believe.

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