Minutes of Proceedings. 
xxi 
The nickel is confined to a few veins which run through the mass of the 
meteorite. From these veins crystals of the alloys can be separated by 
dilute sulphuric acid, in which the alloy is insoluble. These crystals seem 
to be skeleton forms built up of triangular plates, the interstices being 
filled up with amorphous carbon. The iron is very soft, but patches of 
hardness occur. The Widmanstatten " lines are not so well developed 
as in most iron meteorites, probably due to the nickel being located 
in veins instead of disseminated throughout the whole mass. The 
weight of this meteorite was about 50 kilogrammes, and it is markedly 
magnetic, having a number of poles. The alloy of nickel and iron retains 
its susceptibility up to a dull red heat. 
" Seismographic Eecord of the South African Earthquake of October, 
1910," by J. E. Sutton. 
The extent of the movement of the horizontal pendulum during the 
quake was about one-half its average daily E.W. oscillation. 
" Colloidal Gold and Purple of Cassius," by James Moir. 
Description of behaviour of chloroauric acid dissolved in 200,000 parts 
of water towards a number of reducing agents. The colouration produced 
by pure stannous chloride, SnCls, is not purple of Cassius but a brown of 
remarkable stability, which the author shows is not due to extreme fineness 
of division, and which may be colloidal aurous chloride. Purple of Cassius 
results when SnGl^ and an oxidant with loosely bound oxygen are 
employed. The tin in the purple is shown to be merely a vehicle for 
finely divided gold, the shade varying from pink to indigo according to the 
rapidity of formation, the first division being obtained by the slow 
reducing action of glycerol. 
" Some Bemarkable Oxidation Products of Benzidine," by James 
Mom. 
An investigation of the beautiful blue products obtained from benzi- 
dine by certain processes of oxidation, such as the blood test. The 
products obtained by the action of chromic acid and of ferricyanide 
are shown to be the chromate and ferricyanide respectively of dipheno- 
quinone-diimine NH : CeH^ : CeH^ : NH, but the latter is an extremely 
reactive substance and polymerises easily to very insoluble substances of 
the aminoazo-dye class. Benzidine is the sole reduction-product of the 
blue substances as freshly prepared. The violet azo-dye appears to be 
NH, • C^Hg • N : N • C.Hg • NH^. 
"The Egyptian Influence on Ehodesia Euin Builders, or Vice Versa," 
by H. W. Tarbutt. 
The object of this note is to show that Maclver's statement that 
the Ehodesian ruins are of native origin does not seem too improbable, 
if the articles found in or about the Ehodesian ruins are compared 
with similar articles of Egyptian primitive art. The author contends 
