84 



THE GUIDE TO NATURE 



must work swiftly and dextrously. 

 The least noise, a slight blunder, a 

 little haste or an instant's hesitation 

 and the prize specimens will be sailing 

 safely above your head. When you 

 have turned your light upon the tree 

 do not shift the rays away until you 

 have finished, else the change from 

 light to darkness may startle the wary 

 watchers. It is a fact that some varie- 

 ties of moths get stupidly drunk and 

 it is no fun at all to take them, but 

 to capture the really desirable species 

 requires skill and adroitness and is 

 great sport. — "The Butterfly Farmer." 



changes from central to mountain. 

 The traveler may take his choice, at 

 either sundial, according to the direc- 

 tion in which he is traveling. Each 

 dial is about thirty feet in diameter. 

 The rims are brick. 



Sundials Made of Small Rocks. 

 Mr. Fred Harvey of Kansas City, 

 Missouri, kindly contributes to The; 

 Guide to Nature two photographs 



Why People Walk in Their Sleep. 



BY DR. ROBERT T. MORRIS, NEW YORK CITY. 

 (In response to an inquiry) 



Several explanations have been 

 given for sleep-walking. One expla- 

 nation is this : , 



The brain is never asleep as a whole, 

 A part of its action, expressed in what 

 we call the subjective mind, is more 

 or less "aware" all of the time, day 

 and night. Thus, if we wish to arise 

 at an unusual hour in the morning, we 

 usually awaken at the time desired. If 



A NOVEL SUNDIAL AT DODGE CITY, KANSAS. 



of sundials — one showing mountain 

 time, the other central time. So far 

 as construction is concerned, the dials 

 are practically similar, both having the 

 hour lines made of small rocks. We 

 reproduce herewith the one showing 

 central time. Here is a good sug- 

 gestion for our young folks. In almost 

 any place a sundial of this form could 

 easily be constructed. It would be in- 

 teresting to watch the progress of the 

 shadow of the slanting pole along the 

 hour line. 



These sundials are at Dodge City, 

 Kansas, where the railroad time 



a clock stops in the middle of the night, 

 we arise and set it going, if we are 

 not too lazy. Sometimes a source of 

 irritation, like a decayed tooth or an 

 improperly digested meal, will awaken 

 just enough of the brain to make one 

 wish to do things which he would not 

 do if fully conscious. The partly awak- 

 ened portion of the brain may take the 

 individual off on a walk ; it allows him 

 to avoid obstacles and to engage in 

 simple acts. Some people talk in their 

 sleep, others walk in their sleep, oth- 

 ers attend strictly to business when 

 thev are in bed. 



