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 
Greenwich, 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, (, N. Y.)—noted at 
8 o’clock, A. M.—ror 1829. 
October. November. December. 
BS Peg : eee, ot. + 9 ae 
2, 44 - - 43 ee 40 
35>: $6 - - 45 ~ - 38 
4, 42 - - 42 . - 20 
5, 44 - - 42 - - 42 
Vor. XVII.—No. 2. 25 
