THE GUIDE TO NATURE.— ADVERTISEMENTS. 



XIX 



WONDERS IN THE MINERAL KINGDOM 



All around you, often with homely exteriors, there are wonderful 



minerals. 



Have you ever seen the inside of a rough Chiastolite crystal ? 



This illustration will show you a few of the many odd forms you will 



find. 



Send us 10c for a crystal with one face polished to show the interior. 

 Study up on this odd formation and others. 



Prof. Dana's entertaining book, "Minerals and How to Study Them" 



tells you all about them. 



Write today for further information. 



WARD'S NATURAL SCIENCE ESTABLISHMENT 



84-102 COLLEGE AVE., ROCHESTER, N. Y. 



(PATENT APPLIED FOR) 



A new optical instrument, used with an ordinary camera lens, 

 which produces any degree of distortion in the picture. Any one 

 may be photographed as tall or short, fat or thin, as a grotesque 

 monstrosity or artistically beautified by means of this simply 

 wonderful instrument. 



The Distorto is composed of an oblong prism-lens, pivoted at 

 the side, so as to swing through a large angle. It is handsomely 

 mounted in nickeled brass, with adjustable rubber covered tongues 

 to fit over the front of the camera lens. 



When the prism-lens stands parallel to the camera front it 



produces no distortion, but by simply tipping the thick end 



towards the camera lens, any degree of expansion or elongation 



of the image is produced in one direction and by tipping the thin 



end of the prism-lens towards the camera lens any amount of contraction or shortening is obtained. 



You simply slip the Distorto over the front of the camera lens, set the prism-lens at the angle 



to give the desired degree of distortion and make the exposure as usual. 



Prices 



to I 5/16 inch diameter Si. 35 post-paid 



" 1%. 200 



" iH " " 2.70 



3-6o 



5 4° 



No. 1 Fits Lens of 



1 



i 7 /& 



T / 



2 y% 



*% 



Send for New Tariff Changed Mail-Order Cash catalogue. 

 -:- Also new Ross Lens and Camera Catalogue. -:- 



GEORGE MURPHY, Inc. 



57 E. NINTH ST., N. Y. 



