Vne fe\rerell ftt>ft esphmwi oti tint fappofitioft.-— Proljabilky t&at thr metals w&nld cvapo- 

 tate, w!;en expofeci to the sfticm of tbt fun's rays, were they met good conduKEiors of heat. 

 ■ — Mercury is aSually found to evapornte und«r the hifcati tetnperatare of the atmo^jJiere. 

 irhis fad is ti fttiking -proof that iflurd inertiHry is a non-corvda£bor of heat.— Probii'jiHiy 

 that the heat genevatcd by the rays of light is always the fame ili intcuGtv ; «fld thjit tltofc 

 cffeftS Vrhlch have been attributed to li'ght ought perhaps in all cafes to "be afcribed to th« 

 aftron of the heat geiretated by them : a flriking proof that the moil iratenfe laeat does 

 fometimes exift where \ve fliould rot expert to find i't.— GoM aftually melted by the be«t 

 which exifts in the air of the atrnofpliei-e, where there is no appearance of fire, or of «ny 

 thing red-hot. — We ought to be cautious in attributing to the aftion of unknown powers, 

 €iFe£ls fimilar to thofe produced by the agency of heat. — The moft intenfc heat may exift 

 v.'ithcut leaving any vifible traces of its exiftence behind it. — This important fsiSl illuftrated 



. by the necefTary refult -of an imaginary experiment - - P^^e 345 



Chap. IV. An account of a variety of mifcellaneous experiments.-— Thermometers witli 

 cylindrical bulbs may be ufed to fliow that liquids are non-conduftors of heat. — Ice-cold 

 Nvater m ay be heated and made to boil ftanding on ice.— Remarkable appeara-nces attend- 

 ing the thawing of ice, and the melting of tallow, and of bees-wax, by meuns of tlie rsi- 



. Biant heat projefted dD-vtmWards by a red-hot bullet.— Beautiful cryftals of fea-falt formed 

 in brine (landing on mercury. — Olive-oil foon rendered colourlefs by CKpofttre to the air 

 landing oti brine."— An attempt to caufe radiant heat from a red-hot iron bullet to defcend 

 in oil. — Account of aft artificial atmofpliere, in which horizontal carrerrts were pioduced 



: "by heat. — Conjeflures refpeiSting the proximate caufes of the winds - page 367 



A Praftical Effay on the C!ub-Foot, and other Diftortions in theLegs and Feet of Children, 



intended to fliewuwder what Circumftances they are curable or otherwife; with thirty-one 



■Cafes, and the Specification of a Patent granted the Author for his Method of Praflice. 



By T. Sheldrake, Trufs-maker to the Weftminfter Hofpital and Mary-le-bone Infirmary. 



8vo. S14 pages, with 14 plates. London: Printed for Murray andHighley, 1798. 



This author -fliews by reafoning and induftioii, that the deformity -which forms the chief 



'fiibjedl of 'his trcatife is produced by iin unfavourable comprefTion during the ^owth of the 



foetus in uterb. He adduces faSs to prove, that mechanical means, if judicioufly applied, 



■will in numerous inftanccs reftore or place the organ in its proper ftate; and tltat it is of 



great importance that ttefe remedies fhould be ufed as early as poffible before the proeds 



of ofllfication is confiderably advanced or completed. The contrivance and application ©f 



ihefe means neceflarily demand a knowledge of the formation of the parts, as well as of;shc 



hature of mechanical inftruments. In both refpeds the author appears to have difplaycd 



confiderablc judgment, and has been rewarded by fuccefs. Itisrmpoffible to enter into 



■any detail or defcription of his method within our limits. I fliall therefore only -fey, that 



the nature of the cafes and the refpe£tability of the tcftimonies appear to deferve the 



attention of all wrho from profeffional purfuits or individual misfortune arc urgtd ix) -the 



'Confideration of this fubjeil. 



