vili CONTENTS. 
Page 
On the Strength of Telegraph Poles. By W. H. Prexrcz, F.RS., 
MEST HG Mis pe aode cco scudasovodst vedsdabesons sosmaetdoneeRensereuree® Senses sn sbeneecoecceaoee 853 
On the Use of Index Numbers in the Investigation of Trade Statistics. By 
STEPHEN, CDOUBNE, .Ls9.G.0052caecsesconsnetadeessocens thas tesetcacuccse ee speeteeeanees 859 
The Forth Bridge Works. By ANDREW S. BIGGART, C.E...........ssccccsseceees 873 
Electric Lighting at the Forth Bridge Works. By James N. SHoorsren, 
STA sa ME AMIBL:O FBI ms cacesech ons cnceas cateee dnceetsetrece reste css'¥assceaceon eee eeneneeee 879 
The New Tay Viaduct. By Crawrorp Bartow, B.A., M.Inst.C.E............. 883, 
