Miscellanies. 409 



more water ; mix and ascertain the bulk of the solution. To a meas- 

 ure of the solution from the chloride, add from a measure, some of 

 the alkaline solution, till it ceases to produce a precipitate : note the 

 quantity used, which may be called the equivalent decomposing 

 quantity, for the sample of chloride used. Take for every like meas- 

 ure of chloride solution, one-sixth the quantity of the pearlash solu- 

 tion, that was found necessary for decomposing the powder. Mix 

 the solutions, and when the precipitate has subsided, decant the clear 

 liquor, and evaporate to dryness by rapid ebullition in glass or ear- 

 then vessels. Dissolve the soluble part of the mass, by boiling it in 

 water ; filter or concentrate till a pellicle appears ; the solution, by 

 cooling, and subsequent evaporation and cooling, deposits all the 

 chlorate in crystals; wash them in cold water, redissolve them in the 

 smallest quantity of boiling water : large crystals of the pure chlo- 

 rate are obtained by slowly cooling the solution. 



12. Astronomical Observations, made at the Royal Observatory at 

 Greemvich, in the months of April, May and June, 1828 : by John 

 Pond, Astronomer Royal. — These observations, published by the 

 President and Council of the Royal Society, " at the public expense, 

 and in obedience to his Majesty's command," are a continuation of 

 that series of astronomical labors by which the Observatory of Green- 

 wich has contributed so largely to the perfection of modern astrono- 

 my. The present number comprises observations on the transits of 

 the fixed stars and planets over the meridian, and on the north po- 

 lar distances, and the altitudes of numerous stars. It affords, as well 

 in the manner and form, as in the contents, a striking example of the 

 finished style in which the business of this renowned Institution is at 

 present conducted. 



This document was transmitted by the Royal Society of London, 

 through Wm. Vaughan, Esq. to the Library of Yale College. 



13. Register of the Thermometer at Brooklyn, (JV. Y.) — noted at 

 8 o'clock, A. M.— FOR 1829. 



