— 
Vili CONTENTS. 
Pace. 
XXI Observations on the Barometer, Thermometer, and 
Rain, at Manchester, from the year 1794 to 
1840 inclusive. By Joun Datton, D.C.L., 
L.L.D., F.R.SS. L. and E., Member of the Insti- 
tute’ of, France, 820. 805 .0ccetsceveescos'ss Midesuneets 561 
XXII Ondetecting the presence of Arsenic, particularly 
in reference to the employment of “ Marsh’s Test.” 
By Henry Hovucs Warson, Esq,, .......00.e000. 590 
XXIII Observations on the various accounts ofthe Lumi- 
nous Arch, or Meteor, accompanying the Aurora 
Borealis of November 3rd, 1834. By Joun 
Daxzrton, D.C.L.,.L.L.D.. F.R.SS., L. and E., 
Member of the Institute of France, &c. &c...... 617 
