Part 48

Wood, 26, 27, 28

Woolworth Building, 302, 303

Wounds: treatment of, by artificial light, 10

X-ray: production of, tubes during War, 131; 137, 150, 270, 280

Young, James: discovers petroleum, 56

Yttria, 85

Zeitung, Cologne: 157; extract from, on street-lighting, 158

Zinc, 125, 130, 267

Zirconia, 84, 85

Transcriber's List of Corrections

LOCATION ORIGINAL CORRECTED

Chapter II and similiar material and similar material

Chapter XIII as a constant level at a constant level

Chapter XIV the carbons to distintegrate the carbons to disintegrate

Chapter XV John Pechham John Peckham coated with an allow coated with an alloy with various billiant with various brilliant key in depressed key is depressed

Chapter XVI has nearly doubled have nearly doubled

Chapter XVII this own indifference their own indifference

Chapter XXIII Nature's lighting varied Nature's lighting varies

Chapter XXIV so-called cadelabra so-called candelabra possibilties possibilities

READING REFERENCES ...Applications an Theatre." ...Applications au Theatre."

INDEX Photo-micography Photo-micrography Siemans Siemens