EXPOSITION OF 1867. 
371 
communicating by pipes 1 ft. to 2 ft. in diameter, with four air¬ 
compressing machines having a total power of 105 horses 
nominal. The arrangements being thus complete, each 
machine, at the will of the operator, could be made to supply 
to its group of jets air at a pressure equal to 29J-to 31J inches 
of water; which being directed along the radial shafts and the 
annular shafts communicating therewith and admitted through 
registers in the floors, would at the same time expel the 
vitiated air through ventilators in the roof and draw after it, 
by induction, pure air from the outer world. The cost of 
ventilation by this means was calculated to be a little less 
then two cents for every 353,165 cubic feet supplied. 
With the foregoing facts and figures before us, and the 
remembrance of the stormy character of the season, which 
seriously retarded the work, we are able to get some faint con¬ 
ception of the vast amount of labor and money required to 
transform the sandj^ waste of the Champ de Mars into the- 
wonderful microcosm it became in so short a time.' 
THE ARRIVAL OF CONTRIBUTIONS. 
Napoleon and the Commission of his appointment had done 
their work thoroughly and well. Not so the contributing 
nations. The nothern countries—Eussia and the Scandinavian 
States—were ready in good time and magnificently installed ere 
the end of March, but all the rest were sadlv chaotic. 
Facilities never heard of before were furnished them. At 
London all goods had to be hauled on immense vans and 
other wagons from the various docks and railways. While 
here, through the iniervention of the circular railway that sur. 
rounds Paris and communicates with all the radial roads and 
depots, goods consigned to the Exposition were not only 
brought to the very entrance to the Champ de Mars, but, upon 
tracks laid all through the Park and around, and even in, the 
exhibition building, heavy machines and massive contribu¬ 
tions were discharged almost on the very spot where they were 
to remain. Nevertheless, on the day before the Opening there 
was a confusion with which the historic disturbance around 
