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 Mir Editor --1he Thermometer being an nslru- me in general for estimating the temperature within certain limits, it Is essential that those who refer iu them should be made acquainted with the er- rois Ia winch ihes lable sinre ordinary ihermU- meters are frequently inaccurate. and lead to gross errors m estimating correctly the degree of eNpau- sion o the atmosphere. and lhe general circnmsan- res by which ilS indications influenced. l. there lnrc, beg lcarr tn offer facts for the considea ton ut yonr readers who may possess thermometers, and refer |" then for inc indications of tine variations ul ihe temperature.

 Though an accurate thermometer is one of the most valuable instruments of philosophical research, II must be confessed that the information they yey oi the relative state of the atmosphere, cannot be accurately obtained in any given or situation lroin those in general use, great many of them are made without any regard to the accuracy of the two points corresponding the melting temperature; office, the boiling temperature o the water to the equal division oi the intervening degrees, in hetmo ically sealing the tube when tle mercury has been expanded Inc full length of the tube, Sc. Sc. Upon these principles depend the utility of this kind of philosophical instruments. Now il is equal l y important, but comparatively neglected, that in asrertalulng inc relative Vane of the degrees of tenn perature, the thermometer should be only secured from the direct rays of the sun, but that il should be ont of reflected sunshine. A thermometer hanging l last Sundav at the door Gf store in Royal street, |, l indicated l00o, while my thermometer of known ac- curacy, at 9I', Qhe highest this year, differ ence ot SIX degrees. Many persons do not consider what Is intended to he measured by the thermometer in those IL Is not the heat of the sun, the air of room which has a free circulation of air through 1t, but the point 10 be asceltained is, the heat of the atmosphere. Place your thermometer where there is free circulation of air, and re- iecting sunshine, and you will ascertain the heat of the air yon breathe

 Sneh variety of opinions exist ofthe true state of the temperature, that propose daily report from Thermometer employed in Meteorological observa- tions, made by Francis of Philadelphia, whose in- struuenls have the merit of great accuracy and of execution, and much sought after by those ,vlio are interested in the srience.

 THERMOMETER.