4574 On Artificial Sea Water. 



in at once arriving at the correct relations. Thus, the gallon of water 

 being equal to 10 pounds, if we wish to estimate the proportions of 

 materials for that quantity, or for 100 pounds, 10 gallons, it only 

 requires that the decimal point should be removed, in the first case, 

 two figures, or, in the latter, one figure to the left, and we have the 

 whole operation completed and the result exhibited in decimal frac- 

 tions of the pound; thus for 100 lbs. or 10 gallons: — 



Chloride of sodium .... 2*706 



„ of magnesium . . . 0367 



„ of potassium . . . 0*076 



Bromide of magnesium . . 0*003) , , 



oil. r • rtrt __ v anhydrous = 0*472 crystals. 



Sulphate of magnesia . . . 0*230) J J 



„ of lime 0*140 *» , , ^ „_„ . , , 



Carbonate of lime .... o^}*"^""* = 0-178 erystalhzed sulphate. 



It will be observed, that, in order to simplify the notation, I have 

 decreased the extended places of decimals and employed the nearest 

 amount to such fraction, by this means throwing off three places of 

 figures. Then, by reducing these decimal fractions to the nearest 

 value in terms of avoirdupois pounds and ounces, the proportions 

 will stand thus for the 100 pounds of water produced : — 



Gosse. 



Chloride of sodium 43^ ounces. 35 ounces. 



„ of magnesium 6 „ 4£ „ 



„ of potassium l£ „ 0^, „ 



Bromide of magnesium 21 grains. 



Sulphate of magnesia anhydrous 3f oz.= crystals 1\ ounces. 2£ „ 



Sulphate of lime anhydrous 1\ oz. = crystallized . 2f „ 



Carbonate of lime 21 grains. 



In order to exhibit the extent of the error 1 have alluded to, I have 

 placed in the adjoining column the proportions deduced by Mr. Gosse 

 from the same analysis and for the same quantity of water, one of the 

 ingredients having been omitted, besides the two that exist in so small 

 a quantity. Now, as Dr. Schweitzer's analysis is on a given weight of 

 which the saline ingredients constitute a part, it becomes necessary to 

 deduct their weight from the 10 gallons of water employed: this, it 

 will be seen, amounts to 60| ounces, or in round numbers to 60 ounces, 

 which is equal to three imperial pints, so that 9 gallons and 5 pints 

 will be the true proportion of water to be used. 



The next point that presents itself is as to the best mode of obtaining 

 these saline ingredients for the manufacture of the artificial sea water, 



