All left a residue on evaporation, but two being free from Chloride and Sulphate. Six contained no metals, the remainder being more or less contaminated, and thirty-two highly charged with lead. A few very clean waters were found among them, but most gave a decided tarry odor when supersaturated with acid, and contained Ammonia. Carbonate largely.

In a few stores visited, a clean, stronger water was diluted so as to approximate the standard 10 per cent.; but for the remainder, the strengths below 10° B. show what is largely used in medicine, as well as sold over the counter. As these specimens were stored under varying conditions and kept for varying periods, they do not indicate what is sent out by manufacturers.

To secure data showing changes in strength due to long or careless storage, a record of two.carboys was kept from time of receipt until the contents were exhausted. No. I was tightly closed, the sense of smell perceiving no escape of gas. No. 2 was closed by the earthen plug usually employed for stopping carboys.

These two samples probably represent the extremes of loss of Ammonia among the whole number examined. The results obtained can be relied on as indicating the strengths made to correspond to the several degrees Baume.

To show what is supplied by manufacturers, unopened packages were obtained and examined, with the results tabulated below. A few samples were received in corked bottles, and on this account did not stand the permanganate test as well as is required, but they were mostly free from objectionable amounts of empyreuma.

Specimens marked A to E came from makers of medicinal chemicals, the remainder from those who make this article for use in the arts where a clean and well adjusted water is not required.

As the result of the examination, it may be stated in a general way, that Commercial Water of Ammonia, as sent out by the better manufacturers, is, with few exceptions, quite clean or free from objectionable quantities of impurities, and while not always approaching the standards as closely as is desirable, is yet fairly well adjusted to the different degrees under which it is sold. At the same time, it should be remembered that the market is well stocked, if not flooded, by makes of very inferior quality and poorly adjusted strengths. The officinal tests are full and sufficient, and their use will result in the rejection of a very large percentage of the Water of Ammonia offered for sale.