COLD FIRE.

Cold fire is a coming invention. So also is heatless light. You may find them in nature already, if you but inquire intelligently into her secrets.

Cold flame is exemplified in the firefly, and the glowworm gives forth heatless light.

Such flames and lights are not mysteries. Their cause is due to one of the subtlest forces in the universe—ether.

Only in an indirect way are the human senses acquainted with this wonderful substance. Yet ether flows through the earth's atmosphere in mighty currents, unchecked, resistless, and subtle. The ether is the direct parent of the X-ray and the speech of the wireless telegraph.

When man shall attain the perfect vacuum, then the rude ether blush of the electric-light bulb will give forth many times more light, purified and heatless, soft and healing as the light of the stars, penetrating as the sun. An examination of the firefly, when emitting flames or light, shows bodily movements that cannot be understood to mean anything else than vacuum producing.

The lights are always seen in the vacuum sac on the back. Immediately before emitting light, the insect will flatten the body, draw the legs in, droop the head, seemingly contracting in all directions; then with the relaxation comes the flame and light. The bodies of the glowworm and firefly always are transparent when filled with flame. The blades of grass or other debris are seen plainly through the bodies. Here are cases of nature anticipating man and dealing with X-rays.

ESPECIALLY IMPORTANT!!

MOTOR STORIES

A New Idea in the Way of Five-Cent Weeklies.

Boys everywhere will be delighted to hear that Street & Smith are now issuing this new five-cent weekly which will be known by the name of MOTOR STORIES.

This weekly is entirely different from anything now being published. It details the astonishing adventures of a young mechanic who owned a motor cycle. Is there a boy who has not longed to possess one of these swift little machines that scud about the roads everywhere throughout the United States? Is there a boy, therefore, who will not be intensely interested in the adventures of "Motor Matt," as he is familiarly called by his comrades?

Boys, you have never read anything half so exciting, half so humorous and entertaining as the first story listed for publication in this line, called "Motor Matt; or, The King of the Wheel." Its fame is bound to spread like wildfire, causing the biggest demand for the other numbers in this line, that was ever heard of in the history of this class of literature.

Here are the titles to be issued during the next few weeks. Do not fail to place an order for them with your newsdealer.

No. 1. Motor Matt; or, The King of the Wheel. No. 2. Motor Matt's Daring; or, True to His Friends. No. 3. Motor Matt's "Century" Run; or, The Governor's Courier. No. 4. Motor Matt's Race; or, The Last Flight of the Comet.

32 LARGE SIZE PAGES SPLENDID COLORED COVERS

PRICE, FIVE CENTS PER COPY

AT ALL NEWSDEALERS, OR SENT POSTPAID BY THE PUBLISHERS UPON RECEIPT OF THE PRICE.

STREET & SMITH, Publishers, NEW YORK

NUMBERS 1 TO 396

TIP TOP WEEKLY

ARE CONTAINED IN THE MEDAL LIBRARY

We know that there are thousands of boys who are very much interested in the early adventures of Frank and Dick Merriwell and who want to read everything that was written about them.

We desire to inform these boys that numbers 1 to 396 are pretty well out of print in the TIP TOP WEEKLY, but all of them can be secured in the numbers of the NEW MEDAL LIBRARY given below.

The NEW MEDAL LIBRARY AT FIFTEEN CENTS

150—Frank Merriwell's School-days. 167—Frank Merriwell's Chums. 178—Frank Merriwell's Foes. 184—Frank Merriwell's Trip West. 189—Frank Merriwell Down South. 193—Frank Merriwell's Bravery. 197—Frank Merriwell's Hunting Tour. 201—Frank Merriwell in Europe. 205—Frank Merriwell at Yale. 209—Frank Merriwell's Sports Afield. 213—Frank Merriwell's Races. 217—Frank Merriwell's Bicycle Tour. 225—Frank Merriwell's Courage. 229—Frank Merriwell's Daring. 233—Frank Merriwell's Athletes. 237—Frank Merriwell's Skill. 240—Frank Merriwell's Champions. 244—Frank Merriwell's Return to Yale. 247—Frank Merriwell's Secret. 251—Frank Merriwell's Danger. 254—Frank Merriwell's Loyalty. 258—Frank Merriwell in Camp. 262—Frank Merriwell's Vacation. 267—Frank Merriwell's Cruise. 271—Frank Merriwell's Chase. 276—Frank Merriwell in Maine. 280—Frank Merriwell's Struggle. 284—Frank Merriwell's First Job. 288—Frank Merriwell's Opportunity. 292—Frank Merriwell's Hard Luck. 296—Frank Merriwell's Protégé. 300—Frank Merriwell on the Road. 304—Frank Merriwell's Own Company. 308—Frank Merriwell's Fame. 312—Frank Merriwell's College Chums. 316—Frank Merriwell's Problem. 320—Frank Merriwell's Fortune. 324—Frank Merriwell's New Comedian. 328—Frank Merriwell's Prosperity. 332—Frank Merriwell's Stage Hit. 336—Frank Merriwell's Great Scheme. 340—Frank Merriwell in England. 344—Frank Merriwell on the Boulevards. 348—Frank Merriwell's Duel. 352—Frank Merriwell's Double Shot. 356—Frank Merriwell's Baseball Victories. 359—Frank Merriwell's Confidence. 362—Frank Merriwell's Auto. 365—Frank Merriwell's Fun. 368—Frank Merriwell's Generosity. 371—Frank Merriwell's Tricks. 374—Frank Merriwell's Temptation. 377—Frank Merriwell on Top. 380—Frank Merriwell's Luck. 383—Frank Merriwell's Mascot. 386—Frank Merriwell's Reward. 389—Frank Merriwell's Phantom. 392—Frank Merriwell's Faith. 395—Frank Merriwell's Victories. 398—Frank Merriwell's Iron Nerve. 401—Frank Merriwell in Kentucky. 404—Frank Merriwell's Power. 407—Frank Merriwell's Shrewdness. 410—Frank Merriwell's Set-back. 413—Frank Merriwell's Search. 416—Frank Merriwell's Club. 419—Frank Merriwell's Trust. 422—Frank Merriwell's False Friend. 425—Frank Merriwell's Strong Arm. 428—Frank Merriwell as Coach. 431—Frank Merriwell's Brother. 434—Frank Merriwell's Marvel. 437—Frank Merriwell's Support. 440—Dick Merriwell at Fardale. 443—Dick Merriwell's Glory. 446—Dick Merriwell's Promise. 449—Dick Merriwell's Rescue. 452—Dick Merriwell's Narrow Escape. 455—Dick Merriwell's Racket. 458—Dick Merriwell's Revenge. 461—Dick Merriwell's Ruse. 464—Dick Merriwell's Delivery. 467—Dick Merriwell's Wonders. 470—Frank Merriwell's Honor. 473—Dick Merriwell's Diamond. 476—Frank Merriwell's Winners. 479—Dick Merriwell's Dash. 482—Dick Merriwell's Ability. 485—Dick Merriwell's Trap. 488—Dick Merriwell's Defense. 491—Dick Merriwell's Model. 494—Dick Merriwell's Mystery.

Published About January 5th

497—Frank Merriwell's Backers.

Published About January 26th

500—Dick Merriwell's Backstop.

Published About February 16th

503—Dick Merriwell's Western Mission.

Published About March 9th

506—Frank Merriwell's Rescue.

Published About March 30th

509—Frank Merriwell's Encounter.

Published About April 20th

512—Dick Merriwell's Marked Money.

Published About May 11th

515—Frank Merriwell's Nomads.

Published About June 1st

518—Dick Merriwell on the Gridiron.

Published About June 22nd

521—Dick Merriwell's Disguise.

STREET & SMITH, Publishers, NEW YORK CITY