1 ^ ^ Accounts of Books, 



All the circumftances of thefe phxnoinena being thus fully confidered and explained, 

 and no doubt remaining of their charaders and caufes, they may be called Irides by 

 InfteBhn. 



A general View of the Nature and OhjeEls of Chemlftryt and If its Nature and Application to 

 Arts and ManufaElures. By William Henry, Member of the Royal Medical-, and Natural 

 Hi/lory Societies of Edinburgh ; of the Chemical Society of Jena in Saxony: and of the Literary 

 and Philofopbical Society of Manchefler. OiStavo, 44 Pages. Johnfon. London. 



-It is ufual for thofe philofophers who undertake to explain the feveral departments of 

 faience by leftures, to publifli a fyllabus, or outline of their fubjedl in the order according 

 to which they propofe to treat it. Thefe fliort works, if drawn out with ability, are not 

 only of eminent ufe to the clalTes who may attend the ledurer, but alfo to the community 

 at large, as exhibitions of the (late of fcience, and admirable helps to the memory. Some 

 of thefe works have the form of a fyftematical enumeration : others that of a regular 

 difcourfe. The prefent work is of the latter kind, and prefents an elegant and comprc- 

 henfive view of the objefts, nature, and application, of chemical fcience. 



Defcription d'un Telegraphe tresftmple et a la portee de tout le Monde, avec line Planche. A 

 Paris, chez Vauteur, rue de la Libert's, No. 83. Pluvoife An. 8. de rimprimerie de Vin- 

 flitut des aveugles-travailleurs, 16 Pages in 8vo. Prix 8 sols. — Or, a Defcription of a 

 veryfimple Telegraph, praElicable by any Perfon : with an Engraving. 



The telegraph propofed by this author is the human body : the arms of which are ca- 

 pable of forming with regard to each other, as well as to the perpendicular line of the 

 trunk, a great number of figures, fufhciently diftindl: to be eafily feen at confiderable dif- 

 tances by the naked eye, or with a telefcope. The author developes his method, and the 

 means of carrying it into efFedt •. and he thinks, that in this manner lines of moveable 

 telegraphs may be formed, which may become very ufeful in war, to keep up a fpeedy and 

 conftant communication between the different bodies of an army, or between the fixed 

 telegraphs of other conftru£i:ions. 



This memoir is part of a larger work on the prefent and other fubjeds conneiVed 

 it, which will hereafter appear. 



Magazin. Encycl, 



