412 Scientific Intelligence. 
“sneer: _— pp. 8vo. Philadelphia, snag (J. B. Lippincott & 
Co.).—Group I was that including ores and mineral products, 
building pn marbles and other la and ornamental stones ; 
also implements and machinery used in eone cree with the same, 
and various statistics aa to the e_ volume contains 
by J..8. 
re. 
Mémoire sur la ene et la composition Minéralogique 
- Cotioute e, par A, Renarp, §. J., Conservateur au Musée Royal 
d’Histoire Naturelle ds Belgigen 44 pp. 4to. Brussels, 1877. 
(Mém. Cour. Acad. Roy. Sci., Be elgique, vol. xli.)}-The author of 
this memoir proves by his investigations, that the fine yellowish 
whetstone, making the best of hones for razors, which is quarried 
at Salm-Chateau, Lierneux, Sart, Bihain and Recht, in Belgium, 
composition of the whetstone of Recht, according to Dr. von 
hes, Mark (1) and M. Pufal (2), is as follows: 
Bia TiO, AlO; FeO; FeO MnO MgO Ke fee K,0 
1. 48°73 tr. 19°38 2°42 _ rh et 2 Ba 0-2 ‘bt SOL oth ae Ftr=99°88 
2. ives 117 23°54 1°05 0-71 17°54 1-13 wos oentt 2°69 HO 3-28, CO, 0°04, 
P20; 0°16, 8 0°18, Doaeenes a Pee 13 
The slate, which is feebly metamorphi c, is a damourite slate or 
appears to consist of very minute nules—more than 100,000 in 
a millimetereube, and they show sometimes the form of the rhom- 
bohedro n view of the form and the cient the nae 
Zirkel. 
] enard eit Pieter whetstones of other localities without tan 
most nnection with rocks, which con- 
a t exclusively 0 of prints though quartz and orthoclase 
