CONTENTS. XV 



Page 

 Mr. David Greig on Steam Cultivation 15-5 



Mr. John Halliday on the Heating of Hot Houses 155 



Mr. A. S. Hallidie on an Improved Suspension Bridge 155 



General Haupt on the Application of Machinery to Boring and Tunnelling . . 155 



M. Ferdinand Komsr on the Iron and Steel at the Paris Exhibition 155 



Mr. J. Lewis on an Improved Marine Steam-Boiler 155 



Professor Macdonald on the Construction of the Lifeboat 156 



on an Improved Paddle-wheel 156 



Mr. S. J. Mackie on Iron Floating Forts, Iron Harbours, and other Floating 

 Structm-es ; and on Daft's Method of Construction of Iron Fabrics 156 



Mr. J. Clerk Maxwell on the Theory of Diagrams of Forces as applied to 

 Roofs and Bridges ' 156 



Mr. George Maw on Covered Life-Boats 156 



Mr. Joseph Mitchell on a new Mode of constructing the Surface of Streets 

 and Thoroughfares 156 



Mr. James R. Napier and Prof. W. J. Macquorn Rankine on the Use of 

 Moveable Seats for Slide-Valves 156 



Mr. William Paterson on the Consumption of Fuel 157 



Mr. W. W. Urquhart on some of the Difficulties the Scientific Engineer 

 meets with in Practice 157 



APPENDIX. 



Mr. John E. Taylor on the Relation of the Upper and Lower Crags in Norfolk 157 



Dr. Julius Scharvcz on the Internal Heat of the Earth 158 



M. Charles Martins's Nouvelle comparaison des membres pelviens et tho- 

 raciques chez I'Homme, les Mammiferes, les Oiseaux et les Reptiles, d^duite 

 de la torsion de I'hiimerus 158 



M. Charles Martins sur les Racines a^riferes ou Vessies Natatoires, la 

 synonymie et la distribution geogi-aphique de quelques especes aquatiques 

 du genre Jussicsa 163 



