56 Proceedings of Eoyal Society of Edinburgh. [sess. 
extraction is identical. The residue left on distilling off the ether 
on the water-bath is a liquid of pale straw-colour, with a pleasing 
but faint odour of melons. It boils with decomposition at about 
240°. An analysis of the substance thus obtained, after drying in 
an exhausted desiccator, gave the following numbers 
T735 gr. substance gave *3770 gr. C0 2 
and *1423 gr. H 2 0 
Found. Calculated for Adipic Ether. 
C 59*26 59-41 
H 9-11 8-91 
The product thus appears to he practically pure adipic ether. From 
70 grams potassium ethyl succinate 15 grams of adipic ether were 
obtained. 
A portion of the ether was saponified with alcoholic potash, and 
from part of the potassium salt thus produced the silver salt was 
precipitated, while another part was converted into the acid, which 
was purified by shaking its ethereal solution repeatedly with small 
quantities of water. The acid melted at 147° : the melting-point 
of adipic acid is 148°. The white silver salt was analysed for silver 
with the following results : — 
*2388 gr. silver salt gave -1428 gr. silver. 
Found. Calculated for Silver Adipate. 
Ag. 59-8 60-0 
The Action of Sodium Carbonate and Bromine on 
Solutions of Cobalt and Nickel Salts. By Dr John 
Gibson. 
(Read February 17, 1890.) 
(Abstract.) 
In 1862 Field gave a brief account of a peculiar green solution, 
prepared by adding nitrate of cobalt to a solution of bicarbonate of 
soda containing a small quantity of the hypochlorite of that alkali. 
The author observed the formation of a similar green solution when 
making qualitative separations of chromium from other members of 
