442 F. H. Storer—Ammonia a contaminant of Sulphuric Acid. 
100 grams (orc. c.) of the 
rier Of Ng 
Sulphate of alumina, pure from Marquart, 20 grams rave 
too much ammonia to be measured by the Nessler pro- 
cess (as used by us), and so did 5 arene, ‘nas ch. 
Sulphate of iron (ferrous sulphate), 5 grams urified, 
from Powers & Weightman of Philadelphia, gave 
COQ0GS prim Of EmInGhiA, (22 2 oo Sos Se ee 0701240 
Ditto, common copperas, the last of an apothecary’s barrel, 
5 grams gave 0°00507 gram of ammonia, ----. - .----- 0710140 
Ditto, copperas of unknown origin taken from a bottle in 
store room of Bussey Laboratory, 100 grams gave only 
000058. eran of ammonia: - 25 62 250. 3 oe 0°00053 
Ditto, a sample of pure pctnlints of iron from Marquart 
gave a — —— for ammonia when tested quali- 
tatively, an eaction was obtained also from a sam- 
ple of Bases sulphate (“ ie a3 alcohol,”) —....-+ 
Sulphate of lime, pure Sag p nts Som Marquart, 35 
grams gave 0° 0002 gram .of ammonia,. -... «.~..-<+<4 0°00057 
Other lan pied of sulphate of a tested in a shgavy 
different way, gave the following results : 
of ground gyps obtained originally at a a seed Os 
but kept in a sean voi of the Bussey Institution for a 
year or more, were percolated with pure water (two 
0°00392 gram of ammonia was found in the distillate. 
On adding lime a new portion of ammonia equal to 
900008 wan piven offices | Sok econ ues das 0000784 
0°00003 gram of ammonia on being boiled in pure 
vga and no more ammonia came off on adding milk 
ie ee 0°00015 
150 ataiag of plaster of Paris, taken from a box in the 
Bussey store-room, gave 0°0035 gram of ammonia on 
ing boiled with water alone, and Bes gram more 
of ammonia came off on boiling with lime,..--- ------ 0-00284 
20 grams of plaster of “Paris taken fot ‘a keg found 
standing in a recently built house, gave 0:000035 gram 
of ammonia on being boiled with water ee eee 0°000175+ 
~~ of potash, chemically pure, from oe mmsdorff, 
grams gave only a faint trace of ammonia, - - -- -- - alanis 
Boeke, of soda, —, yey crystals pam Mar- 
- , 20 grams gave no of ammonia. 
result was verified by many dualitative “tale, eaneense 0-00000 
Bisulphate of soda from Marquart, gave strong reaction 
or ammonia when tested qualitatively,...---.------- ™ 
Sulphate of copper, pure es m Marquart, 10 grams gave oS 
Asada red 5 Gram o AP AMMO  Ss a  aa onse w s= = 0001 ee 
