366 



Mr. 



Yiigve 



Bjornstahl on Magnetic 



instance, one obtains crystals of the form (111) or (100). 

 The gold crystals, galvanically precipitated, are often of the 

 form (100), (111), (110), (311); all being holohedral forms 

 of the hexakisoctohedral class. 



Crystals of this symmetry are magnetically isotropic ; 

 one is forced to conclude that each particle in the colloidal 

 gold solutions consists of a crystal, which belongs to another 

 crystalline system. Thus the disperse phase does not show 

 the same structure as the ordinary metal ; and having full 

 evidence as to its metallic nature, we must draw the inference 

 that it is constituted by an allotropic modification of gold. 



Table I. 



<?=2-5xlO- 



;— 73/i^u. 



Xi= 



=700 /i/«. 





1 



H. 



A'. 



£xio* 



3200 



7-2 



7-0 



5210 



15-9 



5-9 



7630 



33-1 



51 



10260 



58-0 



5-50 



12600 



87-7 



5-50 



14520 



117-5 



5-56 



15970 



143-9 



563 



17030 



167-3 



5-76 



17900 



184-0 



572 



18500 



194-9 



5-19 



19400 



211-3 



5-61 



20200 



2336 



5 70 



21200 



251-2 



5 60 



Table II. 



cxlO 6 . 



^5 X 107 - 





H 2 



250 



531 



167 



2-56 



111 



1-77 



743 



1-14 



49-5 



0-69 



33-0 



0-51 



Table III. 



Sol No. 2. 

 :24>/j, c= 1-25x10 ■ 



Table IV. 



Sol No. 6. 

 2 r=73 \x\i, c=l-25x 10~ 4 n. 



H = 19400 Gauss. 







H=1940 



Grau ss. 









A 









A 



X. 



A'. 

 191 



a^T' 



• 



\. 



A'. 



^540 



705 



1-57 



705 



103-1 



1-28 



685 



15-8 



1-29 





685 



86-7 



1-08 



610 



16-S 



1-38 





610 



90-5 



113 



575 



15-3 



1-25 





575 



87-4 



1-09 



540 



12-2 



100 





540 



80-3 



100 



490 



7'5 



0-61 





490 



62-5 



0-78 



445 



6-8 



0-56 





445 



54-2 



0-67 



