Morning journal and courier., 1882-04-28
0nn Session,

| PROF. CHITTENDENs TEsTIMoNY-THE soIEN- I T1FIC SEARCH FOR POISON IN THE REMAINS OF l JENNIE CRANIER-THE STEPS IN THE ANALYSIS | THE RESULTS.
 The testimony of Prof Chittenden was, 8 l few minutes after two o'clock, resumed. MT. Doolttle sat at @ side table having abandoned his usual place to give space at the lawyers | table for the array of scientific apparatus from the s. S. S., jars, glasses, tu5es retorts, etc., which the professor was to exhibit ln illustrating and making plain certain steps ln | the progress of his analysis. These were ob- l jects of special attention to the public pres | ent. When all ready the professor re-
 sumed The professor weighed seven milli- grams of the oxide of ron; from this he cal
 culated that the stomach and assophagus con- 1 tained 739-1 booths of grain of oxide iron. ! The oxide of iron was dissolved in hydro cloric acid. The next step was to ascertain the amount of arsenic and fully identify it as
 arsenic That oxide of iron dissolved in hydrochloric acid, making it chloride of iron,
 which constitutes the fifth exhibit, the chlor- l ide of iron in the stomach and assophagus i; ! my next step was to ascertain the amount of l arsenic and fully identify the substance as
 arsenic weighed out 100 grams of this 1 sample stomach mixture-that is three ounces ] and 23O and 6-1O grains at the examination l of this quantity used method which I have used in each subsequent operation, which l will now describe. ! First, the 100 grains of material was 1 weighed out in this, which is called porce
 lain bowl [exhiblting it]; to this amount of l tissue, after evaporating the alcohol, twenty l three centimetres of pure concentrated | nitric acid was added this was placed in an ! air bath and heated to 15O degrees-that is l nearly SIS degrees Fahrenheit; in this way the entire amount of tissue was dissolved and converted any arsenic present is converted into arsenic acid this heating in the air bath continued for two hours the mixture is heated with nitric acid and then takes on an { orange color.
 Mr. Jones-Is this the appearance it did take on?
 The court-If you give the witness time
 process satisfactorily.
 This operation was repeated sixty
 times, and I suppose one description
 will suffice for all; when this orange color is
 noticed three cubic centimetres of pure sul
 pburic acid is added; this produces very
 violent convulsion the organic matter IS
 completely destroyed and converted into car
 
 if any remains, still remains as arsenic acid
 while still heated eight cubic centimetres
 of pure nitric acid are added drop
 by drop; the mass is then heated for
 about fifteen or twenty minutes; the de
 struction of the organic matter IS then com
 plete; the dish containing the carbonated
 residue or matter is then filled with distilled
 water and the whole is allowed to soak for
 twentyfour hours in this way the arsenic arsenic acid is dissolved out of the water and the carbonated matter is left undis- l turbed the clear solution containing arsenic |
 with little coloring matter is then evapo | rated to dryness on water bath until at last | very small residue is obtained containing all the arsenic that was in the tissue; this | residue is then dissolved in forty-fve centi | meters of diluted sulphuric acid; this solu | tion is then gradually introduced into | Marsh glass apparatus of this description l (showing it); thirty grams of pure zinc are l then placed in it. the zinc alloyed with little platinum small quantity of sulphuric acid is added, which, operating on the zinc, pro- duces hydrogen gas this gas passes through the chloride of calcium tube Gllustrating) l this serves as dry gas, freeing it from moist
 ure; the gas then passes through this glass tube (showing it), issues at the end and finally the hydrogen is lighted and becomes a | blue flame it should be colorless flame;
 when the apparatus is completely filled with hydrogen gas the substance which is being examined for arsenic is poured into the upper globe so Gllustrating); then the stop cock here is turned and the fluid is allowed to flow drop by drop into this lower bulb in which the hydrogen is being continu- ously formed in this manner the solution containing the arsenic is brought in contact with the hydrogen and the arsenic combines with the hydrogen, forming gaseous con- pound called arseninreted hydrogen; the ar seninreted hydrogen passes out this (shown) glass tube this tube rests on 0 small gas furnace the three burners being lighted we obtain six inches of brightly heated glass. Now the arseninreted hydrogen passes through this heatsd tube, 1t is decomposed into metallic arsenic and free hydrogen; the hydrogen passes off as in gas, and the ar senic is deposited the glass just about the point where it is cold. The apparatus is al lowed to run until the 30 grammes of zinc IS completely dissolved, usually taking two, three or four hours, depending on the ra- pidity with which the gas is evolved. In the first portion of it acid flows down into the bulb below, 8 second portion of 40 cubic cen timetres of stronger acid is poured in and allowed to flow on to the zinc Then, iastl y, ,4 third portion of still stronger acid of the same kind is allowed to flow on the zinc. These operations change all the arsenic into arseninreted hydrogen In that manner the entire amount of arsenic is obtained in tube as metallic arsenic
 The apparatus is then taken apart and the portion of the tube containing the metal is gut out with file illustrates making piece of glass containing all the metallic arsenic. That is carefully weighed. The tube plus the mirror is weighed. The incustration of ar senic is dissolved out by nitric acid. The tube is rnsed with water and finally dried md at last is again weighed. The difference ( between the first and second weighings gives ' he amount of metallic arsenic deposited In he tube; 100 grammes of the stomach mix ure tested in this way gave Q metallic de- oosit weighing 3-10 of a milligramme. This