silk producers.

III. MINERALOGY, METALLURGY, ETC.--The Mineralogical
Localities In and Around New York City and the Minerals
Occurring Therein.--By NELSON H. DARTON.--Chances for
collecting within one hour's ride of New York.--Methods
of collecting and testing.--Localities on Bergen
Hill.--The Weehawken Tunnel.--Minerals and modes of
occurrence.--Calcite.--Natrolite.--Pectolite.--Datholite.
--Apopholite.--Phrenite.--Iron and copper pyrites.
--Stilbite.--Laumonite.--Heulandite.

Antiseptics.

Crystallization and its Effects Upon Iron. By N.B. WOOD.--
Beauty of Crystals.--Nature of cohesion.--Cleavage.--Growth
of crystals.--Some large crystals.--Cast iron.--Influence
of phosphorus and sulphur.--Nature of steel.--Burnt
steel.--Effect of annealing.

IV. ARCHITECTURE, ART, ETC.--The Cathedral of Burgos, Spain.
--Full page illustration from photograph.

Description of Burgos Cathedral.

Photo-Engraving on Zinc and Copper. By LEON VIDAL.

Meridian Line.--A surveyor's method of finding the true
meridian.--By R.W. MCFARLAND.