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The London Dispensatory, containing : 1. the Elements of Pharmacy ; 2. the botanical Description, natural History, chemical Analysis, and medicinal Properties of the Substances of the Materia Medica ; 3. the pharmaceutical Preparations and Compositions of the Pharmacopoeias of the London, Edinburgh, and Dublin Colleges of Physicians ; the Whole forming a Practical Synopsis of Materia Medica, Pharmacy, and Therepeutics
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PART I.

Elements of Pharmacy.

Ixxiii

Oxygen with vapour of ether.

—-------------------------alcohol.

Nitrous oxide with hydrogen.

--------------------------phosphurcted hydrogen.

--------------------------sulphureted hydrogen.

--------------------------carbonic oxide.

Nitrous oxide with carbureted hydrogen.

--------------------------elefiant gas.

--------------------------vapour of ether.

-------------------------------------- ■ alcohol.

sulphurous acid.

Nitric acid with hydrogen, and probably all the pre-ceding combustible gases and vapours.

--------------------------sulphurous acid.

Nitrous gas with hydrogen.

----------------------sulphurous acid.

Hydrogen with sulphurous acid.

--------------------carbonic acid.

Vapour of water with carbureted hydrogen.

-------------'-----■--------olefiant gas.

Some of these decompositions are produced by combustion,and are instantaneous; others take place without combustion,and are consequently very slow.

Oxygen and sulphureted hydrogen gases when mixed toge-ther do not suffer any change; " but if the mixture be madeto approach an ignited body, combustion immediately takesplace, and the products vary according to the proportion of thegases mixed." In all cases a great proportion of the sulphuris deposited, and some sulphurous acid is formed, owing tothe caloric evolved by the combustion of the hydrogen settingfire to a portion of the sulphur.

If oxygen gas, in a small proportion, and carbureted hydro-gen, or oxygen and olefiant gas, be exploded together, charcoalis deposited, and water and carbonic acid produced; besidewhich an inflammable gas, named by Berthollet oxycarburetedhydrogen, remains, occupying more than double the space ofthe original gases. But if the proportion of oxygen be large,that is, twice the bulk of the carbureted hydrogen, and threetimes that of the olefiant gas, these two gases are completelyconsumed, and the products are water and carbonic acid.

The vapours of ether and of alcohol, detonate when certainproportions are mixed with common air, or rather with theoxygen it contains; and the products are carbonic acid andwater: the quantity of the former being very considerablewhen the vapour fired is that of alcohol. If the proportion

 
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