31 



Conjectures relative to the origin of Numeral Hieroglyphics. By 

 T S Davies. — From the Atithor. 



Bulletin de la Soci6t6 d'Encouragcment pour I'lndustrie Nationale, 

 pour les Anne6s 1824-33. Jan. F^vr. Mars, Avril, Mai, Jum. 

 — F)-om the Society. 



Astronomical Observations made at the Royal Observatory at Green- 

 wich. By the Kev. Dr N. Maskelyne. Vols. 2, 3, and 4. 



Astronomical Observations made at the Royal Observatory at Green- 

 wich, from 1811 to 1832, 44 parts. By John Pond Esq 



M^moires do I'Academie ImpMe des Sciences de St-P^tersbourg, 

 VIme S(:Tie (Sciences Mathematiques, Physiques, et Natu- 

 relles). Tomes i. and ii. Livres 1, 2, 3, 4. 



M^moires de I'Acad^mie Imp6riale des Sciences de St-PteWg 

 VIme s^rie. (Sciences Politiques, Histoire, et Philologie.) 



Tomes i. and ii. « -,^,1 i. 



M6moires de I'Acad^mie Imp^riale des Sciences de St-Petei^bourg. 

 Present68 pars divers Savans, et lus dans ses Afisemblees. lome 1. 



Livr. 1-6. . , . , 



Recueil des Actes de la S6ance pubUque de 1' Academic ImpMe 

 ■ des Sciences de St-Petersbourg, 1828-32. 5 pai-ts.-f-rom the 



Imperial Academy. 

 Verzeichniss der Pflanzen. Vom Dr C. Anton Meyer.-i^rom the 



Author. .„. , XT 



Catalogue Raisonnd des Objets de Zoologie recueillis dans un Voy- 

 age au Caucase. Par E. M6n6tries.-i^rom the Author. 

 HypeLthraxis, or the Cholera of Sunderland. By W. Reid Clanny, 

 M.D., F.RS.E., U.^.l.A.—From the Author. 



The following CommuDications were then read :— 

 1 On a New Species of Coloured Fringes developed between 

 certain pieces of plate-glass, exhibiting a new variety of 

 polarization, and a peculiar property which renders them 

 available for the purposes of Micrometry. By Mungo 

 Ponton, Esq. 

 The author, when he first observed these fringes, found that they 

 presented the appeamnce of three rectilinear bands, each consistmg 

 of black, white, and coloured stripes ; but the central baud was after- 

 wards found to be composed of two united into one. There is thus 

 a band for each of the four surfaces of the plates, the two side ones, 

 appertaining to the uppermost and undermost surfaces, and the cen- 

 tre ones to the surfaces which are approximated. The pecuhanties 

 by" which they are distinguished are as follows :— 



a 



