262 BAXTER, WEATHERILL AXD SCRIPTURE. 



combined with the greater part of the bromine. Bulb B, also con- 

 taining mercury, was then attached and exhausted, and the material 

 poured from A to B, where it was again shaken with fresh mercury. 

 Connection was now made with the system C, Y, a, b, First the two 

 liter expansion flask Y was sealed off. Two small fractions a and b 

 were next removed by cooling with liquid air while B was warmed, 

 and all but about 6 cc. was distilled into C and sealed off. The 

 material in a and b was colored yellow, owing doubtless to free bromine. 

 The main fraction in C also was slightly colored, as well as the residue 

 in B. Another distillation into D which also contained mercury 

 followed, and then a series of five distillations into /. In all these 

 distillations a slight cloudiness persisted in the main body of material. 

 Since we feared that this might be a bromide of mercury vaporizing 

 with the silicon tetrabromide, several pieces of bright copper wire 

 were placed in /. These pieces of wire were slightly discolored during 

 the distillation from /, but since a fractionating column, as indicated 

 at c, was used for the first time in the next distillation, it is uncertain 

 whether the copper or the column was responsible for the great im- 

 provement in the appearance of the distillate; for from this point on 

 it remained perfectly clear and colorless. 



After distillation into the bulb L, the accidental breaking of a 

 capillary admitted air and consequently a small amount of moisture 

 to the tetrabromide. With as little exposure to air as possible the 

 material was poured from L into a suitably prepared bulb M and 

 again exhausted as before. After distillation into N, but before seal- 

 ing off the connection to M, N was warmed and 31 was cooled so that 

 several cubic centimeters were distilled back into .1/. This procedure 

 is indicated in Figure 6 as if a light fraction had actually been collected 

 from X. A similar procedure was followed in the next distillation. 



The contents of the bulb d, which contained the heavy fraction 

 remaining after the distillation from 0, were tested for titanium, 

 with a negative result. 



Although a few pieces of copper wire were used in 0, to remove a 

 trace of bromine which was formed apparently by the exposure to the 

 air in L and 31, the first of the four light fractions removed from P 

 had a slight yellow color; the remaining three were colorless. 



After about half the material had been distilled from S to T, four 

 small samples were collected as indicated at h, the remainder was 

 distilled into T, leaving a residue which was collected in three portions, 

 indicated at k. 



The samples analyzed were, 1, the least volatile of three light 

 fractions taken from R, 2, the second most volatile fraction from T, 



