The _dose_ of the _Extract of Ergot_ (Extractum Ergotæ) is from 1 to 15 grains (0.065-1 gm.); of the _Fluid Extract_ (Extractum Ergotæ Fluidum), ½ to 1 dram (2-4 c.c.); of the _Wine_ (Vinum Ergotæ), 1 to 4 drams (4-15 c.c.); of _ergotin_, a concentrated extract, 2 to 5 grains (0.13-0.3 gm.). When given hypodermically abscess is likely to form, even under the most strict antiseptic precautions. =Ether.=—Next to nitrous oxid, this is the safest of the general anesthetics, although it is not so readily inhaled as chloroform, and is more apt to produce unpleasant after-effects, such as nausea and vomiting. The latter may sometimes be relieved by the inhalation of hot vinegar fumes. Death from ether is usually the result of asphyxia, and not, as in the case of chloroform, from heart failure. Internally, by the mouth or hypodermically, ether is sometimes used as a circulatory stimulant in sudden heart failure. Great care should be exercised in handling ether in the neighborhood of lighted gas-jets, as the vapor of the drug is highly inflammable. Ether should be stored in well-stoppered containers, in a cool place, remote from lights and fire. The _dose_ of ether as a circulatory stimulant is from 5 to 30 minims (0.3-2 c.c.) in ice-water or hypodermically. =Formaldehyd.=—This gas is employed in the form of a 40 per cent. solution (_formalin_). It is used as an antiseptic, disinfectant, and deodorant. It is the best disinfectant for sick-rooms that we possess, although on account of its lack of penetrating power it can not be used for disinfecting bedding, stuffed furniture, carpets, books, etc. To be effective the gas must be generated from formalin in a special apparatus, or from paraform tablets heated over a suitable lamp. Attempts to vaporize solution of formaldehyd from an open vessel placed on a stove are unsuccessful, since this treatment converts most of the formaldehyd gas into crystals of paraform. Solutions of formalin—1 : 2000 to 1 : 500—are sometimes used for irrigating suppurating cavities and disinfecting instruments. A solution of 1 part of formalin to 20 parts of water makes a good disinfectant for stools, urine, and sputa.