(Thomas), [40]
(C. G. Stewart), [59-60]
tests for detection of, preliminary, [61-3]
odour test (Tawell’s trial), [24], [34]
smell-blindness (Stewart), [63-7]
silver test, [67-8]
Prussian-blue test, [69]
sulphur test, [70]
guaiacum, uranium, picric acid, cupric sulphate, cobalt chloride, potash and mercuric oxide tests, [71]
peroxide of hydrogen test, [72]