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THE GUIDE TO NATURE. 



Robert Hooke in 1664 while he was fol- 

 lowing a comet with his telescope. Now 

 thousands of double stars are known. 

 The "double-double" star Epsilor in Ly- 

 ra the northernmost of the two little stars 

 making a triangle with Vega, is always 

 an interesting object to view with a tele- 

 scope capable of magnifying 150 dia- 

 meters. The star Gamma in Delphinus, 

 a Job's Coffin, which will be seen below 

 Cygnus and east of Aquila, is also a 

 beautiful double. Gamma is the eastern- 

 most of the four stars of Delphinus 

 shown on the chart. 



There are many meteor showers visible 

 in October. Mr. Denning has identified 

 no less than nine. One of them, occur- 



ring on the nights of the 18th to the 20th 

 inclusive, is usually quite bright, the 

 meteors moving swiftly and leaving 

 streaks behind them. They radiate from 

 a point in the feet of Gemini, the twins, 

 and the radiant focus is well up in the 

 east before midnight. When several me- 

 teors are seen in succession an effort 

 should be made to trace their paths back- 

 ward to a point of intersection. In this 

 way the "shower" to which they belong 

 may be determined. The study of me- 

 teors is one of the branches of observa- 

 tional astronomy which requires the use 

 of no instruments except a pair of quick 

 true eves. 



DOUBLE PHOTOGRAPHS WANTED. 



The Guide to Nature desires skill in the use of the camera in all lines. To 

 that end, a year's subscription is offered for the best double photograph received 

 before December 1st. 



AN INTERESTING EXAMPLE OF A DOUBLE PHOTOGRAPH. 



