“I hope you will not neglect to write me about your progress with my treatment”; “of course you will appreciate that in obstinate cases Ohrsorb must be persisted with for some time before the improvement can begin to show itself.” and offering for future supplies three 4s. 6d. tubes for 10s. 6d. The “Special Ohrsorb Compound” is supplied in collapsible tubes, and the 2s. 9d. size contained just over ½ oz. of ointment. The directions were to rub the ointment once, twice, or thrice a day over the skin close behind the ear, and also from just beneath the ear around to the front of the throat, for three to five minutes. The ointment, nearly black in colour, contained about 70 per cent. of vaseline, and about 4 per cent. of beeswax, a little soap, and a little saponifiable fat; sulphur and ammonia were present in combination, and the dark constituent appeared to be of the class represented by thiol, tumenol, and petrosulfol, artificial compounds intended to take the place of ichthyol, and like it containing much sulphur in combination but free from its disagreeable odour. The total sulphur found in “Ohrsorb Compound” was 0·8 per cent., which corresponds to about 8 per cent. of one of these substances. An ointment made up with tumenol, soft paraffin, wax, and a little ammonia soap resembled “Ohrsorb Compound” very closely, though the correspondence was not quite complete. It was not considered worth while to isolate the dark constituent in a state of purity permitting of more precise identification than is here indicated; to determine the detailed characterization of such a substance a large quantity would be necessary. CHAPTER XVI. REMEDIES FOR EYE DISEASES. The proprietary articles advertised for the cure of diseases of the eyes, though perhaps not so numerous as some other classes of nostrums, vary a good deal in nature, but the claims made for most of them are equally comprehensive. The results of analysis of a few are here given and it will be seen that two of them, including one called “botanic,” are mercurial ointments. Another advertiser seems to think or pretends to think that cataract can be cured by bathing the eyes with soda alum dissolved in coloured water, while we come across also an “Ophthalmic Institution” selling for external application an anti-cataract mixture consisting of glycerine with a little potassium iodide and starch. SINGLETON’S EYE OINTMENT. This is stated to be prepared, by a person whose name is not Singleton, at an address in London. The price charged is 2s. for a pot containing about 55 grains. The ointment is described on the outer package as “An Absolute Specific for all Eye Troubles and Diseases.” On a circular enclosed in the package it was stated: