X LIST OF PLATES. 



Condensation Nuclei (Wilson. Plates by Barus): Page. 



Plate I. Charts showing nucleation from Oct. 2 to 28, 1902 206 



II. Charts showing nucleation from Oct. 27 to Nov. 24 206 



III. Charts showing nucleation from Nov. 24 to Dec. 8 206 



IV. Charts showing nucleation from Dec. 6 to Dec. 20 206 



V. Charts showing nucleation from Dec. 21, 1902, to Jan. 4, 1903. 206 



VI. Charts showing nucleation from Jan. 4 to 18, 1903 206 



VII. Charts showing average number of nuclei per cubic centi- 

 meter on successive clays of the years 1902-3 and 1903-4 206 



VIII. Curves showing the average number of nuclei per cubic centi- 

 meter in successive months of the years 1902-3 and 1903-4 _, 206 

 A Lightning Spiral (KLiN(iELFUss): 



Plate I. Fig. 1, photograph of lightning flash; fig, 2, photograph of 



induction coil spark 258 



II. Klingel fuss's Patent Inductorium 258 



New Methods of Lighting (Berthier): 



Plate I. A drawing-room wall and ceiling effect obtained with Moore 



tubes 274 



Electric Welding (Thomson): 



Plate I. Fig. 1, an electric tire- welding machine: fig. 2, an electric 



welding machine for iron and steel pipe 282 



II. Another form of hoop or tire welding machine _ . 282 



III. Fig. 1, rolls of electrically welded wii'e fences of varying 



width and mesh; fig. 2, an electric chain- welding machine-. 284 



IV. Electric rail welding on street railways 284 



V. A welding machine for large tubes or shells 284 



Discoveries in Photography (Hunt): 



Plate I. Joseph Nicephore Niepce 290 



« II. Permanent photogi-aph by Niepce _ 290 



in. H. Fox Talbot 294 



IV. Talbotype of Pembroke College, Oxford 294 



V. L. J. M. Daguerre . . 298 



VI. Fig. I, Niepce's apparatus; fig. 2, Thomas Wedgewood 298 



VII. Fig. 1, Tall)ofs studio; fig. 2, Calotype printing apparatus .__ 302 

 Work of the Reclamation' Service (Newell): 



Plate I. Canal line crossing on Dunlap Creek, Montana 374 



II. Typical scene in North Platte Canyon, Wyoming 374 



III. Shoshone Canyon, Wyoming 378 



IV. Looking up North Platte River, Wyoming 378 



V. Detailed view of Shoshone dam site, Wyoming 378 



VI. Malheur dam site, Malheur River, Oregon 378 



VII. Looking up Cottonwood Creek, Oregon . . 382 



VIII. Pear orchard on Rockefeller ranch, Oregon 382 



The Yuma Pro.ject (Lippincott): 



Plate I. Relief map of the Yuma project 384 



Multiple Origin of Horses and Ponies (Ewart): 



Plate I. Fig. 1, Professor Ewart's yearling wild horse in summer coat: 



fig. 2, Celtic pony, showing tail lock in midwinter .... 444 



II. Fig. 1, a typical Celtic pony in winter coat; fig. 2, a richly 



striped dark yellow-dun horse of the Norse type 444 



E(iYPTIAN AND ARAHIAN HORSES (D'AvENNES): 



Plate I. Egyptian horses; bas-relief at Thebes 458 



II. Egyptian horses; bas-relief at Karnak 458 



III. Zedan, a pure-blooded Arabiiin colt 462 



IV. Obeyran , an imported Arabian stallion. 462 



