A. The following is my own experience of the differences between strychnia and morphia.—C. G. S. | MORPHIA. | STRYCHNIA. | Concent. H2SO4—cold. —”———”—–warmed. To this warmed solution add:— | If pure, nothing at first. Violet, not strong. | If pure, nothing. Some yellow-brown. Do. | MnO2. | Red, changing slowly to brown, then orange. On dilution, yellow-brown. | Deep blue purple —tored purple— cherryred—finally (changes slow). On dilution, rich orange red. | K6Cfy2. | Violet, changing to orange; not strong. On dilution, at once destroyed to greenish-yellow solution, turning blue. | Same changes, but more rapid and less distinct. On dilution, at once destroyed to greenish-yellow solution. | K2Cr2O7. | Red-brown, orange-brown, green. On dilution, green. | Same as with MnO2, but more evanescent and rapid in change. On dilution, at once removed to yellowish-brown. | HNO3 concent. | Intense brownish- red, changing to brown— bleached by SnCl2. | In the cold, nothing if pure. On warming, orange-yellow —then SnCl2 brown with excess to yellow. |
B. The chlorine used in the separation of arsenic (p. 385) must be pure. The best process for making it is to heat pure potass. dichromate with pure hydrochloric acid. The latter may be obtained by heating the “pure” acid of commerce in a retort until a portion of the distillate gives no indication of arsenic by the tests. The remainder in the retort is then arsenic-free. ERRATUM. Page 397, line 11, for “Waislow,” read, “Winslow.”
TRIALS FOR POISONING.
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