VOL.8, NO. 7
ANALYSIS OF ANIONS. I1
1395
TABLE VI--(Conlinued)
v
10.-
BrOsc101-
Special tests
2 2 1
1 1 1
+ + +
NOnNO2NOaNO.NOaB0.c BO*-
(FeSO, CHaCOIH test) (Urea HCI test) (FeSO, HdO, test) (NaOH Al test) No2-, 500 (Reaction in flask) (Reaction in test tube with capillary)
2 1 2 1 3 5 0.5
SOaSOa-
(Test with BaCIs and 1%) (Test with BaCL and Br.)
1 1
+
Because of the difference in actual unknowns analyzed, i t was somewhat difficult to make accurate comparison of the analytical results obtained by the use of this scheme with those obtained by other methods. It may he said that without question the results were distinctly better than those obtained by the use of other systems by our classes. The results obtained by a class of 22 students are tabulated in Table VII. TABLE
vn
Total number of unknowns analyzed Number of perfect reports Per cent of perfect reports Number of reports 75% perfect or over Per cent of reports 75% perfect or over Per cent correct reports on individual ions
196 92 47 %
138 70.5Y0 74%
Literature Cited and TANNER, (9) GABXIEL
J. Am. Chm. Soc., 50, 1385 (1928).
Public Gets Benefit of Poison Gas Patent. An international race for a patent on a poisonous gss has been wan by the U. S. Department of Agriculture, and the public will get the benefit. Two scientists of the Department, Dr. Ruric C. Roark and Dr. Richard T. Cotton, discovered that ethylene oxide is an exceedingly effective destroyer of weevils and other insects that infest stored food products. A well-known German dye company patented the gas for use as a fumigant abroad, and applied for a patent in this country. However, the priority of the American scientists' claim was recognized by the U. S. Patent Office, and their patent has been dedicated to public use. The same substance has another usefulness which was discovered by Prof. R. B. Harvey of the University of Minnesota. I n its liquid form, it can he injected into the soil among the roots of weeds, poison ivy, barberry bushes, or other undesirable plants, killing them within a few hours.-Science Service
