"The lowest form of phoenogamous vegetation. It consists," says Lindley, "of lenticular floating fronds, composed of stem and leaf together and bearing the flowers in slits in the edge." It forms the green scum found on stagnant ponds and dykes. It is found in two varieties, the _Lemna minor_ and the _Lemna gibba_. Before going any further I may as well at once make a bald as well as a bold statement, and say that the special province of _Lemna minor_ is to pitch with vigor upon the nostrils; from the very moment I began prescribing it this was beyond question evident. I can think of no possible source of error except that this beneficial action may be due to the germs adhering to the fronds of the _Lemna_ rather than to the pure plant-force. To guard against this I have carefully filtered my tincture, but this has not made the slightest change in its beneficial influence. CASE I. Woman aged seventy-four; admission date, September 24, 1892. Nose never clear; breath very unpleasant; for twelve hours nose bled continuously last Christmas; unable to smell properly; hearing for the past seven or eight weeks bad; watch not heard on contact. Prescribed _Lemna minor_ [Greek: theta]A. October 1, 1892: Feeling of cold in nose is better; sense of obstruction nearly gone; can smell better; hears on contact on both sides; no medicine. October 22: Decided, though slight improvement in hearing; nose, throat and all parts around more comfortable. Last attendance. In proceeding with the consideration of the action of this remedy, I must consider myself fortunate in having the following case to bring forward: 1. A boy of fourteen, whose nose was completely blocked up for the last two years, and whose nostrils were full of polypi, the nose itself being broadened, and in whom the nose had been cleared out by operation a year ago at St. Bartholomew's Hospital, was sent to me by my colleague, Dr. J. H. Clarke. The boy never remembers having smelt anything, and the polypi can easily be seen blocking up both nostrils. From the 26th of November, 1892, to the 4th of March, 1893, four doses of _Lemna m._ [Greek: theta]A were given at regular intervals without much change, then _Calcarea carbonica_ 200 was given, and two weeks after, as he had faceache, _Mercurius_ 3d dec., and on the 8th of April following the faceache was better but the nose in no way improved. Then _Lemna_ was given again, and this time with the most pronounced relief; the nose became much clearer, and he went on taking it, and it alone with scarcely an exception, in fortnightly doses, till the 14th of March last, when his nose was quite clear, with none but a very small polypi visible; he could breathe freely and his sense of smell had completely returned.