(j(5 



Topical parameter : •/ : i{) ; w := Ü.3580 : 7,7010 : 5.6950. 



Willi oold water we obtained on |01(){ elongated, ooniinnnly 

 irregularly .slia|iO<l coiTosioii-ligiires. Tliey seem to he syniuictrical 

 with I'ospect to JIOOj, hut ijcrt'cct certainty could not lie |)i'()cui'ed, 

 notwitlislandiiig many altenipis made tnr this |(ui'|tose. 



XI. Ritceinir Ijnleo-TrietlnilenedKr))i'me.-Cohaltl-i-ho(laiiulf. 

 Foi'inula : jCo ^Aeiii),! ((!NS)j. 



The compound was jii-eparcd by double composition of the raceniic 

 bromide with a concentrated solution of pi;tassiinnrlio(laniile, washing 

 the yellow precipitate, and rccfystallising from hot water. The crys- 

 tals grow to rather large individuals in the solution, saturated at 

 room-temperatnre and have a Hat, spindle-like shape. Accordi !g to 

 analysis, they are (nihi/droas. 



Red-yellow or yellow-brown, Hat. spindle-shaped, acute, often 

 distorted crystals, which are easily measurable. 



]\homhic-hipiira)nidal. 

 a : A:r=r 0.8405: J : 0.8130. 



Observed Forms ■ s r^r {201j, prominent and reflecting well, but 

 sometimes giving multiple images; i =: {OlOj and j) ^ {1'20\, giving 

 extremely sharp reflections, and thus e.xactly measurable ; m := (110', 

 lustrous, somewhat smaller than /> \ o^j211j and ,?: = |321j, as 

 narrow hluntings. The crystals are elongated parallel to the />axis, 

 in several cases also parallel the r/-.\is ; in the last mentioned case 

 the habit of the small crystals is the acute, spindle-like one already 

 described, (fig. 12 a, Ji and c). 



a - h. c 



R.iocniic Ti ii'llivlcMii'cliaininrColialli rlioil.Tiii(li\ 



