Ammonia was in excess on 19 occasions in the month of January, but of a total of 25 testings: the average for the entire month being 4.11 grains (maximum 7.5.) This excess above the maximum allowance (2.5 grains in 100 feet of gas) was due to unavoidable causes, in connection with alterations being then made in the purifying machinery, which, having since been perfected, the ammonia has sunk to an almost infinitesimal quantity. In the Appendix I have given the quarterly returns of the chief examiner, showing the results of the _daily_ testings—for which I am indebted to the courtesy of Mr. Wakefield, the Clerk to the Metropolitan Board of Works. These returns show in detail the facts above stated, and prove that the gas has been up to the Parliamentary standard, as estimated by the prescribed tests. Nevertheless, complaints have been made by persons living in various parts of the parish, of the deficient lighting power of the gas. It must be assumed, therefore, that in some cases the burners in use have been in fault. There can, indeed, be no doubt that many consumers fail to obtain a proper light, owing to the habitual use of bad burners, or to the neglect to cleanse good ones. Burners that were of sufficient capacity for the cannel gas, with which the parish was supplied during the first half of the year, are inadequate, and are not adapted to burn common gas so as to produce a good light. Some consumers who have reported the sufficiency of the light when proper burners have been employed, have complained of the great increase in the amount of their gas bills, and in a few instances, I understand, the dissatisfaction has been so great as to lead to a discontinuance of the use of gas. It is a remarkable fact, often observed—a fact that makes us almost despair of ever getting “cheap gas”—that the bills seem always to increase when the price is lowered! How this is brought about I do not pretend to explain; but, so far as my experience goes, it would seem that gas bills never were lower than when the price per thousand feet was at its highest. I do not think that extravagance in consumption—as a result of decrease in price—can be admitted to be a sufficient explanation of the phenomenon. There are mysteries in gas manufacture and supply, which may be revealed hereafter, and the discovery may both enlighten us on the point now mentioned, and also explain the occurrence of complaints of bad light, concurrently with the satisfactory results of the nightly examinations of the gas at the appointed testing station.