DEVELOPMENT <>F ILUMIXATI' •>". 



lii_ r l)t fnun ;t candle namon Uluminant. That the li'_ r ! " 



lemical product would seem to si - Fact that 



- - by products which check combustii 



- - . products which aid combustion _ rid that 

 the product of the pr ss * apparently carbon di 



the origin of "phosphorescent' light is it may d< 



• -. - _ iphically stat< I 'liver J. 



ret ol the fireflj I _ ink 



might l • furnish the energy aecess to light 



trie circuit. From this standpoi fessor Lodg - - lor- 



is the wast nergy in th»- machinery trie-light maki . 



now in us 



Most of the 150s - f animals which are lig _ habit 



- . where their light is of small importance to ma :er- 



ful phosphorescence of th»- tropics - s, which ha.- drawn forth n. 

 - riptions of its beauty, is caused by the collective lights of myri 

 of infusoria on the s :' the war 



The day opens uj> a rast field of activities requiring Light for their 

 seeution. Solar light is normal for the carrying on of t - tivi- 

 ties, and the night is normal for ivst and - - 



important phenomena of the day are sunris - set: mdtheda - 



labor resrulati 5 its f to twiliffht, morning 



sun. 

 attended with certain phenomena, which observant 



The Hopi tribe of Arizona, for instance, employ the following terms 

 : se: S - . ,• place of sunrise, 



faintest dav n. first light, . - - . 



yellow light of -tin::- . ~ . 



. " - -: - . . " Few ti - have 



not been ini] — ■ ith dawn and sunset, and few in * me lati- 



failed to mark th - - the s _ the 



on. 



- inlight e y the 



irth's surface, _ i the heig I 



ration of the land, its - tive and reflective qualities, the | 

 of forests and vegetation, the amount of moisture and dust in the 

 cloud formation, and other elements which sugges themselves to the 

 lucing local and ail variation. To th — must be 



- - us and the position in latitude determining the length 

 :ie day and the duration of twilight. 



The superabunda : sunlight has _ I 



warding off and tempering the rays and ameliorating their h 

 • - g - - ss ght man 



s. hats, and par - - for a >n from the h 



I l»r. J. w 



