CONTENTS. 



SUPPLEMENT. 



I. Obfcrvations on Watei-fpoius feen from Nice. By Mr. Michaud, Corrc- 

 fpontlenc with the Royal Acidemy of Sciences at Turin — ?• 577 



State of the weather previous to the .ippcarance of water-fpoiitJ. Vaporous foot of a waler-fpout, 

 unaccompanied by the fpout Itfclf. Defcription of another waterfpout of extreme magnitude, the 

 lower part of which threw out large dreams of vapour and jets of fea water. Termination of 

 water-fpouts on their approach to the (hore. Inftance of the foot and flem being formed at fe- 

 veral miles diftance from each other ; the former of which remained ftationary on the fea until the 

 winds had brought the cloud from which the latter was to ifTue, immediately over the maf» 

 of vapour. Additional facts. Obfcrvations ; and explanation of the drawings. 



II. E.'cperimcnts and Obfcrvations on the Inflexion, Reflexion, and Colour of 

 Light. By Henry Brougham, jun. Efq. (Concluded from p. 563) p. 585 



Explanation of phenomena dependent on the flexibility of light. Interference of the penumbrse of 

 bodies. Colours of light through mediums partially tranfparent. Colours of a flame. Blue (ha. 

 dows. Coloured fringes. Colours furrounding the fun's image — and the flame of a candle. Sir 

 Ifaac Newton's coloured rings by reflexion from a concave glafs mirror. Admcafuremcnt of the 

 flexibihties of the feveral primary rays. Summary of optical fcience. Explanation of various phe- 

 nomena dependent on rcflexibility. Bright llrealcs from a candle when the eyes are nearly (hut. 

 Other ftreaks varioufly coloured formed by reflexion from furfaces of a (ibrous llrufture. Colouri 

 from fcratchcs in a piece of metal ; — from the minute particles of unpoliflied bodies ; — from hairs, 

 fpidets' webs, certain folTils, Sic. Whether thefe principles be fufficient to explain the natural 

 •colours of bodies. The rays of light are not varloufly reflcxible in the manner taught by Newton 

 in Ills celebrated experiment of internal reflexion by a prifm. In that experiment the rays were 

 varioully refleftcj, for no other reafon than becaufe their incidences were different. Imagei 

 formed by reflexion of one uniform colour. Experiment and obfcrvations to llicw that the natu- 

 ral colours of bodies may be produced in this way. Colours of thin plates by reflexion. Sum- 

 mary of propofitions. 



III. On certain Points of Nomenclature. By a Corrcfpondent — P- 597 

 New Publications — — — — P- 599 



A JOUR. 



