210 On the new Sulstance called ode, or Iodine. 
pretty completely all the foreign salts contained in the kelp, and 
to obtain, in a nearly insulated state, the saline compound, from 
which alone iode is to be obtained. 
The mass remaining in the mattrass from whieh the iode has 
been separated, consists of sulphate of potash with a small pro- 
portion of sulphate of soda; hence it would appear probable that 
in kelp an iode may exist in combination with potash or soda, or 
both, as iodine of potash or of soda. When iode is added to a 
solution of subcarbonate of potash a combination takes place, 
and the mixture assumes a dark-brown colour. If a gentle heat 
be applied, this colour dissappears and the solution remains of a 
pale straw-yellow colour, a boiling heat does not separate iode 
from this combination, but if the solution be evaporated to dry- 
ness, the addition of sulphuric acid to the dry mass separates iode 
under its characteristic form. 
I am, sirs, yours, &c. 
ALEXANDER GARDEN. 
To Messrs. Nicholson and Tilloch. 
XLIV. Correction of a typographical Error which occurs in the 
Statement of Mr. Accum’s Process of preparing Iode, pub- 
lished in the last Number of the Philosophical Magazine ; 
with additional Remarks on the Method of obtaining Iode. 
Communicated bys Mr. Accum, Operative Chemist, 'c. 
Compton Street, Soho, March 1814. 
Sirs, wi | wii thank you to notice in the Philosophical Maga- — 
zine for next month the following typographical mistake, which 
occurs in some copies cf that work, published last month; namely, 
for the words oxide of lime, page 146, line 6, read oxide of lead. 
Having been applied to from different quarters concerning this- 
mistake, you will perhaps do me the favour to reprint by way of 
answering my correspondents*, the paragraph again in which 
the error occurs. This paragraph should read thus : 
“ ANOTHER PROCESS OF OBTAINING IoDE. 
‘¢ lode is to be found in abundance in the waste or spent lee 
of those soap manufacturers who employ kelp in the preparation 
of soap. To obtain the iode from the waste lee, let it be boiled 
for a few minutes with quicklime ; strain the fluid and mingle it 
with sulphuric acid in excesst. This being done, evaporate the 
* Mr. Accum embraces this opportunity of returning thanks to those 
correspondents whe have honoured him with their inquiries concerning the 
above error of the press, &c. but reminds them that it is usual on such 
occasions, to pay postage. 
+ The boiling of the lee with quicklime is not essential, but it is neces- 
sary that the sulphuric acid should be added greatly in excess. 
liquor 
