INDEX TO VOLUME 92 



r>*ATURAL SCIENCE Page 



A Horn of Natural Rock 27 



Unaccommodating Wells 29 



No Steam Heat for This House. It Would Melt . 34 

 What Make* the Tumbler Pigeon Tumble in Flight? 43 



The Mole Is a Gormandizer 49 



A Cauliflower of Ice 73 



A Poisoned Sea 73 



Glaze: An Old Winter Foe with a New Name ... 81 

 The Slacker Hen — She Lays Curious but Uneatable 



Eggs 118 



Why Monkeys Use Their Fists 166 



Nature in the Role of Wood Designer 179 



How Floating Particles of Dust Cause a Fire 185 



A Whale Which Strains Its Food Through Whiskers 188 



Nature Herself Branded These Cattle 193 



A Well That Supplies Two Kinds of Water 201 



Why the Horse Is an Aristocrat 273 



What Was the Type of Dog That Went Into Noah's 



Ark? 347 



Forest Skyscrapers 347 



Deep-Sea Fish with Lanterns 366 



Magnetized Birds? Another Explanation of Ac- 

 curate Migratory Flight 368 



The Wise Potato. It Refused to Produce Un- 

 necessary Seeds 426 



Yawning Fishes 440 



1 ntroducins; the Moropus 507 



The Tick Was the First Insect Disease-Carrier to 



Get Caught 517 



If You Don't Smell AH Right in a Bee-Hive. 



You're Kicked Out 537 



Forest Skyscrapers 555 



Why Tanks are Giant Caterpillars 556 



"Educated " Ants the Latest in Animal Training. 580 

 Supplying Water to the Thirsty Rootlets of 



Potted Plants 581 



Good and Bad Mushrooms Hard to Distinguish. . 586 



Trees Stunted by the Wind 664 



Even a Parasite May Prove to Be Useful to Man 67 I 



Have You Ever Found a Thing Like That 672 



Why Isn't It Hotter Nearer the Sun? 700 



Insects Which Eat Tobacco 707 



WhenlsaFeather Not a Feather? When I t's a Hair 726 

 How a Woman Makes Money by Putting Nature 



Under Glass 838 



Nature Carves a Queer Snow-Cave in the Cali- 

 fornia Sierras 865 



An Alibi for the Bee in the Orchard 870 



Something to Lose Sleep Over — Can Fish Hear? . . 886 



The Queer Forms of Some Flies 886 



The Secret of the Wily Snake's Sinuous Glide 892 



PHOTOGRAPHY AND MOTION PICTURES 



Doll* Become Screen Idols 36 



With Thi* Darkroom Develop Your Photographs 



on the Spot 43 



Photographing Your Measure 70 



Enlist Your Camera Lens 72 



A Masking Device Which Brings the Whole Picture 



in the Photograph 106 



How a ^Photograph Can Tell the Efficiency of a 



Pumping Machine 120 



A Portable Cabinet for the Photographer 124 



Races in the Motion Pictures 165 



Forcing an Auto into the Air with a Stream of 



Water 193 



How the Cavalcade Approaches Behind the Scenes 200 

 Home Portraiture for Snakes — Try It on a Rattler 201 

 How Many Tree-Top "Close-Ups" Are Taken . . 224 



Mixing Colors on the Screen 226 



Motion Pictures Fool the Law of Gravity 254 



A Homemade Focusinff Hood for a Hand Camera. 282 



A New Use for Fogged Photographic Plates 316 



Introducing the Inflatable Speecn-Sausage 326 



Screen Thrill* Are Cheaper Now 348 



Motion-Picture* Twice the Regular Size 390 



Motion Radiography 554 



A Motorcycle a* a Vibrationle** Tripod 555 



The Motion-Picture Scene-Shifter Enter* the War 588 

 Seen from Above. Thi* Picture . Would Look 



Different 594 



The Bottle Break*, but Not the Head of the Villain 682 

 l.njoy Your Snap*h'>t* Better by Enlarging Them 684 



I'holographing a Historical Parade 702 



Real Light* for the Auto* in Motion Picture* .... 742 

 Remarkable Photograph uf an Actual Battle Scene 747 



Page 

 Protecting Aviator's Camera Bellows from Wind 750 

 A Reflex Attachment for Use on a Hand Camera 766 

 A Derby Hat Used in Place of Camera Tripod .... 868 



No Double Elxposures with 1 his Device 893 



Photographing Holland in California 912 



Holding Photographic Plates from Tray Bottom . . 942 

 Making Photographic Timer Out of Watch 945 



PHYSICS 



What Causes the Singing of Telegraph Wire*? ... 33 



Making Millions Out of Bubbles 82 



Clearing Out Sewer Pipes with Compressed Air. . . 102 



To Remove Liquid Don't Lift It 119 



PICTURE PAGES 



Preparing the Powder Sacks for 16-lnch Guns 8-9 



Tobacco Growing lO-I I 



The World's Most Cherished Medals 12-13 



Making Candles 14-15 



Taking Motion Pictures in the Canadian Rockies . 16-17 



Making Over the Physically Unfit 18-19 



Making Dolls 20-2 1 



What Happens to the Food We Eat? 22 



Is Your Brain Completely Furnished? 23 



Making Rope 168-169 



Growing Gourds in New Jersey 1 70 



English Jackies Go to School 171 



If You Haven't Chosen Your Vocation, Here Are a 



Few Suggestions for You I 72-1 73 



Reading Flag Signals from the Sky 174 



How Her Jewelled Comb Is Made 175 



Sound Bombs Soar into Air to Warn London of Air 



Raids 176-177 



England's Heroines Are in Her Munition Plants. . . 178 



Nature in the Role of Wood Designer I 79 



Cliff Dwellers 180-181 



Making Isinglass 182-183 



Various Types of German Bombs 328—329 



Packing Sardines 330 



Armless but Not Helpless 33 1 



Mountaineering in the Alps 332 



Made in Winter's Open Air Studio 334 



Quaint Sampans of the Far East 335 



Exercisers for Wounded Soldiers 336-337 



Sir William Tritton, Inventor of the "Tank " 338 



Training Radio Men at Our Aviation Schools 339 



The Right Way to Vulcanize a Tire 340-341 



Where a Ford Has Never Traveled 488-489 



Raising Money for the Red Cross 490-491 



Women Conductors for Street Railways 492 



Some Aspect -of the Work of Our Signal Corps . 493 



Interesting Examples of Camouflage 494-495 



Making Cigarettes 496-497 



New York's Food Scouts 498 



New York Coroner's Office 499 



The Girl Brickmakers of England 500-501 



Gathering Oysters in Winter 502 



Shelter Bridges Near Dixmude 503 



Airplane Caught in Wireless Mast 648 



Launching Hydroairplanes from Battleships 649 



An Armory Converted Into Military Hospital 650-651 



Sacred Animals of the East 652 



The Lack of Coal and Food in Paris 633 



A New Military Litter 654-635 



The Hog Island Shipyards 656-657 



Ancient Chinese Apartment Houses 638 



A Crypt Decorated with Human Bones 639 



The Doves of War 660 66 I 



Mechanical Appliances Used in Surgery 662-663 



Teaching Our Soldiers the Hand - to - Hand 



Struggle 808-809 



Woodenware and Hardware Hat* 810-81 1 



Sterilizing Wagons for the Army . . . : 812 



The Army's Portable Laundry 813 



Patriotic Emblems 814-81 3 



Five Million Pleasure C»r». • Total of 120 Million 



Horse-Power 816-817 



Making Artificial Limbs for Soldier* 818-819 



Making Game Birds Pay 820-821 



Airplane Picture of German Line* 822-823 



PRACTICAL WORKERS' DEPARTMENT 



An Attachment for an Auto to Make a Wrecke* . 121 

 A Guard or Ink Shield for a Penholder 122 



A Liquid to Clean Silverware Without Damage. . . 122 



