f 



Ethers. 

 Lavender camphihe, 1 oz. from 4, or even less, of oil. 



Thyme camphire, crystals cubical, does not form a liquid 

 solution either with nitric or sulphuric acid ; is precipitated from 

 nitric acid in a glutinous mass. 



Margaric acid. From oils bv distillation, washing the solid 

 sublimate, pressing it to separate tlie liquid oleine ; used to make 

 candles, but is rather too fusible, melting a little below 60 deg. 

 Fahr. 



Soap campuire. From soaps, by solution in water, adding 

 muriatic acid, collecting the curd, washing it with boiling water, 

 and pressing it to separate the liquid oleine. Is a mixture of 

 stearic and margaric acids; used to make candles, which are 

 very white, as neat as wax candles, and give a brighter light, but 

 do not last so long. 



TuKPENTiXE CAMPHIRE. From spirit of turpentine, by passing 

 muriatic acid gas through it, by which means it will yield about 

 its own weight of a kind of artificial camphire, not dissolved by 

 dilute nitric acid, and when dissolved by strong nitric acid not 

 separated by the addition of water. 



Citron camphire. From the white rectified oil of citrons, 

 exix)sed to muriatic acid gas it absorbs 286 times its bulk, or 

 nearly half its weight, and yields about 9-lOths of camphire. 



ETHERS. 



Hydrocwic ether. Prepared by exposing equal parts of 

 sulpho-vinate of baryta and cyanuret of potassium to a gentle 

 heat in a glass retort, to which a tubular matras is adapted. The 

 product of the distillation is an almost colourless fluid, which 

 separates into two parts, the lighter one being hydrocyanic aether ; 

 its action similar to that of prussic acid. 



^Ethek sulphuricus. Mix gradually equal weights of oil 

 of vitriol and rectified spirit in a retort, and make the liquor boil 

 as soon as possible; continue the distillation until a heavier liquor 

 begins to appear under the ether in the receiver. If half the 

 former quantity of rectified spirit is added to the residue left in 

 the retort, more ether will be obtained. 



Ethku, JEthrr rt'ctijicatiai. yEth. sulphurici fl. 3xiv ; potassse 

 fusa* 5s8; aq. dist. fl. .5ij ; distil, fl. 3xij ; add aq. dist. fl. 5ix ; 

 shake together, decant the ether. Stimulant, antispasmodic, gtt. 

 XX — 3j»s, in water or wine; externally refrigerant, used in head- 

 ach, and in burns, and dropped into the ear in earach. — Officinal 

 I^eparatinn, Spiritus cetheris sulphurici, L. 



Naphtha vixi, ^Tlther vitrioUcus. Spir. a*ther. vitriolici, 

 P. L. 1788, lb. ijss, aq. kali puri 5j ; distil. 3xiiij. 



Nitrous ktueb, jliJther jtitrosus. Put 3xxiv of nitre into 



