PLATES. 



I. to V. Illustrative of Sir David Brewster's Paper on the Optical 

 Figures produced by the Disintegrated Surfaces of Crystals. 



VI. Illustrative of Mr. W, Bardie's Paper on a New Pseudoscope. 



ERRATA IN VOL. IV. 

 P. 305, /or last line read 



f/fdx dy dz .fjcdt ?y*«'""=fffd^ dy dzf^cdt . J'-''^\- 



— 306^ in line 4, before the last clause insert, and if the specific heat of 



any part of the body does not vary with its temperature, 



— 306, /or line 5 read 



fff\o^{t+t)cdxdydz 



T«f fll^^^y^'' -a, 



— 416, line 11 from bottom, /or influences read instances. 



ERRATUM IN VOL. V. 

 Page 111, line 15, /or 



