. The Philosophical magazine; a journal of theoretical, experimental and applied physics. p;c. The accoinpanyinc-profile surveyed by mointhedistrictofPapaijalon the river J\ancheria (5)(Pio Ilaeha) and coni-]»let(d near Toniarazonin the west, and passingthrough the mountainsCerrejon (2) and Potrerode Venancio (3), givesan indication of the stra-tification of the rocks be-tween the Sierra Nevada(4), and the Cordilleraof Ocaila (Perija) which terminates here (1). «, a, a, Red marly sand-stone and laminated marl,alternating above withcalcareous Cretaceousbeds*; h. Tertiary strata;c. Porphyry with
. The Philosophical magazine; a journal of theoretical, experimental and applied physics. p;c. The accoinpanyinc-profile surveyed by mointhedistrictofPapaijalon the river J\ancheria (5)(Pio Ilaeha) and coni-]»let(d near Toniarazonin the west, and passingthrough the mountainsCerrejon (2) and Potrerode Venancio (3), givesan indication of the stra-tification of the rocks be-tween the Sierra Nevada(4), and the Cordilleraof Ocaila (Perija) which terminates here (1). «, a, a, Red marly sand-stone and laminated marl,alternating above withcalcareous Cretaceousbeds*; h. Tertiary strata;c. Porphyry with copperores ; d. Red quartz-porphyry ; e. Plutonicrocks, such as also formthe nucleus of the SierraNevada. * In the uppermost, pale-blue limestone beds of theyounger Cretaceous there are,m this district, near Chorrera,towards the summit of thehill, tlie so-called Geoloo-i-cal organs,—perpendicular,cylindrical shafts, in parts10-12 m. high and 4-5 m. indiameter, wliich I liave fullydescribed in the Zeitschr. GcseUsch. 18(52, and inWestermanns .1/o««z:6-/ie//eM,18G3. ^ [ 1C7 ] XVI. On Dlj^inction-Colours, zclth special reference to Corona,and Iridescent Clouds. By James C. MCoxxel, ^,Fellow of Clare College, Caml>vid(je* LCoucluded from vol. xxviii. p. 289.] 3. Corrections and Additions to the First Paper. IN the article wliicli I wrote two years a^of on this sub-ject occur some actual Ijluuders and some points whiclirequire fuller exj)lauation. The most important blunder liasIjeen already mentioned %. In accordance with the usualstatement of treatises on Optics, I imagined the central spotof the diftVaction diagram to be white, whereas, as a matterof fact, it is coloured with tints similar to those of Newtonsfirst order. Hence what in the calculation I called the firstsitectrum should really have been called the second ; forsecond spectrum should be written third, and so on. Thisdoes not afiect the force of the argument against the theoryof thin plates,
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