—_— nf Gohl « ae ape a 3.0 ae 
a 2 ae 
108 Scientific Intelligence. 
6. Crystallization of graphitoidal silicon—Professor W. H. Mutu 
as examined some crystals of graphitoidal silicon, so called, which were 
that there is no crystallographic reason for separating the graphitoidal 
from the ordinary octahedral variety of silicon. 
law of diffusion ; i.e. the velocity of diffusion of a gas is inversely as the 
9. Adamantine anthracitic earbon.—In the name of M. le Comte d@ 
Douhet, Dumas presented recently to the Academy of Sciences at Paris | 
some nodules of mi on, re their hardness. eee 
were found by Douhet in the hands of a merchant, who supposed them 
to come from Brazil, but their origin and mode of oceurrence are not 
certainly known. These nodules consist of irregularly concentric layers 
When cut and polished on the lapidary’s wheel, they acquire a surptis- 
ing luste i innest nts the mineral is opaque. Its | 
density is 1-66, A preliminary analysis by Friedel showed the presence of 
1 per cent of ash; thus raising the question whether the hardness 8 4 
mn impurities. Dumas therefore e a 
over this ash is neutral in its exaee 
composition: carbon 97-5, hy, ee alk 
