16 APPENDIX. are all, the mean of two concurring trials. This may be shown by calculating the amount of chlorine necessary to combine with the three cases mentioned above, sodium, calcium and magnesium. " Thus the whole amount of chlorine is 505.9472 grains : 265.600 grains of sodium, require chlorine 407.9176, forming chloride of sodium, or common salt; 42.7886 grains of calcium, require chlorine 75.8577 grains, forming chloride of calcium. 6.9682 grains magnesium, require chlorine ^|^g grains, forming chloride of magnesium. The difference between the amount thus calculated, and the amount really found, is but .5966, or little more than half a grain. "You will see that 674 J grains of the whole are common salt. The water would make a salt more than commonly pure. The iron present is proto-carbonate, and is kept in solution by carbonic acid. The quantity is very small. "After the above analysis was completed, the remaining liquid was carefully examined, and small quantities of bromine and iodine were found. The determination of the accurate proportions of these cannot be made, unless upon a fresh sample of not less than 12 or 15 gallons. " For medicinal purposes the determination of these substances would be quite important, but their proportions are so small that much water is required. If you desire it, these determina- tions shall be made, as soon as you can send on some water. If you would like the results in the per centage form, I can have it done for you. " I am sir, yours, " John P. Norton." THE DELAWARE LITERARY INSTITUTE Was incorporated by an Act of the legislature, April 23d,
