46 On the Depth and Saltness of the Ocean. 
remaining solution phosphate of soda and ammonia was added, 
which threw down the magnesia—filtered, dried, ignited and 
weighed, from which calculated the magnesia. 
baryta solution which threw down the sulphuric and carbonic acids 
—filtered, washed slightly and rapidly, dried, ignited, adding a 
few drops of carbonate of ammonia and weighed, then dissolved 
in muriatic acid which dissolved the carbonate of baryta, leaving 
the sulphate—filtered, dried, ignited, and weighed ; from the sul- 
phate of baryta the sulphuric acid was calculated. 
“ Subtracting the weight of sulphate of baryta from the sum of 
the weights of the sulphate and carbonate, onan the quantity of 
carbonate, from which the carbonie acid is calculated. ‘To the 
solution after separating the sulphuric and sebaees acids and. 
the excess of baryta, a few drops of nitric acid were added, then 
nitrate of silver which threw down the chlorine—filtered, wash- 
ing with acidulated water, dried and woigbed; from the chlorid 
of silver the chlorine was calculated. 
“The quantity of soda and sodium was found by snlawosinds 
the sum of the weights of the other ingredients from the whole 
weights of the dry salts obtained by the first evaporation... Four 
or five specimens of water were examined for iodine, bommneead. 
, of which no traces were found. : 
“The filtering paper used was the fine white enepaaits itae 
paper. Equal double filters were used throughout, burned sepa- 
rately in platina crucibles over the spirit lamp, and weighed 
against each other; for the greater part of the salts the filters were 
counterpoised previous to filterin 
“'The water used was distilled in Bohemian glass retorts and 
wae absolutely pure 
‘“ All the tests and reagents were prepared in Dr. Jackson’s 
laboratory and were proved to be pure neaene euunoning them in 
analys and 
is The balance used in taking specific _gravities and for 3 weighing 
the products of analysis was made by Chémin of Parity Fr. ent 
is sensible to the ;3,th of a grain.” 
_ All the tables st the ‘abn of the waters will. hg 
given in the volumes of the Expedition, the two following will. 
show the ingredients of sea-water as determined by the above — 
method by Dr. Jackson. 
pee of water from the depth of 100 fathoms, in lat. 63° 
ma lon. abe W. :—temperature at surface wile “below 30°. 
Mga 's et 
ific rs of the water =1 026; er empe erat 
