XXXVL.. ABSTRACT OF. PROCEEDINGS. 
Experimental.—An inquiry into the accuracy of Field’s 
method wasmade, as it haddistinct advantages over methods 
commonly in use, viZ.,a single precipitation of the iron, and 
the absence, after the removal of added lead, of all reagents 
such as sodium or ammonium salts. Combined with the 
electrolytic determination of nickel or cobalt, the method 
becomes more rapid than, say, a double precipitation of the 
iron by the basic acetate process, and the precipitation of 
the nickel and cobalt as sulphides. Standard solutions of 
carefully purified iron, nickel, and cobalt nitrates, were 
prepared. With these solutions twenty-two analyses were 
made, showing a recovery of over 99% of nickel and cobalt, 
which is a somewhat better recovery than can be made by 
a single basic acetate separation. 
Some remarks were made by the Chairman. 
2. ‘‘Pot experiments to determine the limits of endurance 
of different Farm-crops for certain injurious substances, 
Part Il. Maize,” by F. B. GUTHRIE, F.I.C., F.C.S., and 
R. HELMS. 
The authors communicated the results of experiments 
having for their object to determine the tolerance of maize 
for sodium chloride, sodium carbonate, ammonium sulpho- 
cyanide, sodium chlorate and arsenious acid. These were 
conducted in a manner precisely similar to the series of 
experiments with wheat, published in the Royal Society’s 
Proceedings, Vol. XXxvI., pp. 191 et seq., the results 
obtained being summarized in the following table :— 
Effect upon germination and subsequent growth of Maize of 
different percentages of injurious substances in the sozl. 
rete Seana atooted. preted. 
NaCl °20 °50 10 °25 
Na.CO; °20 "50 "10 25 
NH.CNS ‘005 above ‘02 (001 above ‘02 
NaClO; "004 above °006 001 — 004 
As.O; 50 above °80 05 60 
