THE 



<£&inirorgft 



JOURNAL OF SCIENCE, 



CONDUCTED BY 



DAVID BREWSTER, LL.D. 



F.R.S. LOND. AND EDIN. F. S. S. A. M.R.I. A. 



CORRESPONDING MEMBER OF THE INSTITUTE OF FRANCE ; HONORARY MEMBER OF THE IMPERIAL 



ACADEMY OF SCIENCES OF ST PETERSBURG; CORRESPONDING MEMBER OF THE ROYAL 



PRUSSIAN ACADEMY OF SCIENCES; MEMBER OF THE ROYAL SWEDISH ACADEMY 



OF SCIENCES; OF THE ROYAL SOCIETY OF SCIENCES OF DENMARK; 



OF THE ROYAL SOCIETY OF GOTTINGEN, &C. &0. 



VOL. V. 



NEW SERIES. 



APRIL— OCTOBER. 



THOMAS CLARK, EDINBURGH: 



T. CADELL, LONDON. 

 AND MTLLIKIN & SON, DUBLIN. 



M.DCCC.XXXI. 



