TOPICS IN GENERAL 



787 



*525 



2219 

 525 



*527 



373 



*528 



3461 



795 



2922 



1318 



1614 



3695 



741 



1465 



CLOUD about Mountain top. 1253 



, Azure of incipient. . . . *526 



CLOUD-CAPITALS of View- 

 less columns 



CLOUDLAND, Cities and 



towers of 



CLOUDS, Cumulus 



with Lining of blue and 



CLOTDS, Mageilanic. .' ' '. .'885, 3257 

 , Smoke-like , of darkness 857 



Wait vainly over the 



Sahara , 312 



CLOVERS Distributed by 

 man.. 20 



CLUSTERS. (See STAR- 

 CLUSTERS.) 



COAL, Deposits of 2897 



Despoiled under agency 



of water 



, Deposits of, prove mild 



climate 



Effect of Discovery- 

 possible effect of exhaus- 

 tion 



.Exhaustion of English 



Forests preserved in. . 



, Fossils of the, period. . 



, Gas weighs more than 



the, producing it 



, Gives equivalent ot 



sun's heat 



in Great Britain 



1 Heat of earth instead of 



, Heat of sun measured 



bv heat of ; 2128 



-, Money wasted in vain 



sparrh for 1357 



- - Power 'stored in. . .2657, 2692 



Preserves structure of 



J- ra Iio ri ngof:::: :::::.:: Mi 



COAL-BEDS Buried under 



ocean-rocks 1734 



COAL-HEAVER, Queer sav- 



ings of ** 



COAST, Inroad of sea on 



British 458 



COAST-FEVER Fatal among 



Europeans .. 1030 



COAT, Illusion of cap and... 1556 



COB-WORK, Mass of , 1926 



COCOA, Sustaining power of 1273 



CODE of Honor *529 



CODLING-MOTH Attacks 



COEDUCATION iri 'America 1323 

 COHERENCE not by Chance 453 

 COHESION of Gaseous mass 2433 

 COINCIDENCE of Great dis- 

 coveries *530-*31 



COINS Less interesting than 



fossils 1316 



, Old, increase in purity 2154 



COLD, Contrast of heat and 



in South Africa 637 



, Dead-line of 71 



O f Deep sea intense . . . 3372 



Drought produces tor- 

 por as of 1172 



, Effect of heat and, re- 

 sistless 979 



, Electric conduction in- 

 creased by 1453 



Extreme near pole .... 725 



Has high commercial 



value 1463 



and Heat break down 



rocks 868 



, Heat producing 1463 



, Illusion of heat and .. 1557 



, Influence of, on water 1669 



, Land a conductor of. 3371 



Merely represses bac 



teria 3341 



, Partnership of heat and 2513 



and Pressure in deep 



727 

 3778 

 3373 



. Self -adjustment to. ... 561 



COLERIDGE, Irresolution of 1192 



in Rarefied air 



, Ridges shut off polar. . 



COLERIDGE, Unbelief of, in 



ghosts 2888 



COLLECTING, Mania for, 



seen in lower animals .... 2079 



, Time and cost of, fatal 1754 



COLLECTION of a Wood-rat 2079 



COLLECTORS, in Natural 



history 2457 



COLONY, Home selected for 



new, of bees 2611 



COLOR as Protective from 



heat *535 



, Absence of, helpful. . . *532 



, Adaptation of, to en- 

 vironment 45-47 



of Arctic animals com- 

 monly white 163 



.Assimilation of, to en- 

 vironment 242 



, Bird attacked for un- 

 usual 367 



, Brilliancy of, does not 



accompany musical power 3113 



, Brilliancy of, of male 



birds 408 



, Brilliancy of, of pro- 



48 

 546 



461 

 *536 

 1261 

 *537 



335 



tected birds. 

 , Change of, of Sirius. . . 

 Changed as effect of 



sight 



Depends on observer . 



- , Diet changes, of birds. 



- in Flowers and fruits. . 



- of Ice rivals blue of 

 ocean .................. 



- of Iceberg changed by 

 revolution .............. 1537 



-- , Mystery of, among 



birds ........ : .......... 676 



-- , No Natural, pure ..... 2602 



-- a Negative quality .... *533 



- of Nocturnal animals 

 adapted to night ........ 2417 



- of Objects the color 



they reject .............. 1943 



- , Perception of ......... 1174 



- in Photography Ac- 

 complished ............ ,. . 3001 



- in Photography Prin- 

 ciples ................... 1671 



- of Pigments .......... *538 



-- a Protection ......... *534 



- , Purpose of, in nature. . 2361 



- , Red a prevalent, in 

 fauna of deep sea ........ 2849 



-- -, Reflection necessary to 



give .................... 375 



- , Rich , of breaking waves 3708 



- of Sky artificially pro- 

 duced .................. *540 



- of Sky How produced *539 



- .Spiders resembling 



2771 

 474 



leaves in 



- , Variations in, of stars. 



- Varied with surround- 



ings .................... 94 



- , Variety of, among the 



stars ................... 3618 



- , Variety of, in deep-sea 

 echinoderms ............. 3619 



COLORADO, Ancient, had 



pottery ................. 196 



COLORATION of Animals a 



defense ................. 722 



-- of Arctic animals ..... 47 



-- , Deceptive, among birds 1047 



- , Protective, universal. . *541 

 COLOR-BLINDNESS, Defect 



in retina causes .......... 536 



-- of Dr. Dalton ........ 3653 



- , Effect of ............ 3073 



- More common among 



men than among women . . *542 



- Unknown to person 

 affected by it ............ 1660-61 



COLORING, Conspicuous, 



protective ............... 3586 



- , Gorgeous, of humming- 

 birds ____ . .............. 325 



- , Memory's unconscious 1186 



- , Ostrich invisible by 

 protective ............... 2492 



COLORING, Purpose in plain, 



of female birds 2800 



COLORS in Art 238 



, Birds protected by 



modest 408 



from Coal tar 3589 



, Complementary, cause 



illusion 1562 



of Deep-sea fish *543 



, Double stars of com- 

 plementary 3618 



, Dusky, of nocturnal an- 

 imals 2417 



of Flower Petals 478 



, Flowers and trees ab- 

 sorb different 2737 



of Flowers due to ab- 

 sorption 539 



of Grouse and ptarmi- 

 gan 2179 



, The Humming-bird se- 

 cure with brilliant. ...... 3177 



, Impurity of natural. . . 1608 



, Many hues from pri- 

 mary 2384 



of Mother-of-pearl 



transferred 3505 



Obtained from thin 



films *544 



, Perception of, limited. 2537 



, Prismatic, from inter- 

 ference of waves 1339 



Produced by soap-bub- 

 bles 3134 



Produced by spirit of 



turpentine 549 



, Protective, of animals. 163 



, Protective, in the Des- 

 ert 780 



, Protective, in the Trop- 

 ics 3492 



Result of molecular ar- 

 rangement *550 



, Rich and varied, of 



glaciers 1532 



, Sky combines all 3125 



of Spectrum *545 



of Stars *546-*47 



, Stars of many 3212 



of Thin plates. .544,*548-*49 



of Thin plates Illus- 

 trated 2625 



, Transparency to differ- 

 ent 1083 



, Varied, of birds 2836 



(See also STAR-COLORS.) 



COLUMBUS Aided by an- 

 cient error 764 



, Discovery of America 



by, unintentional 2900 



and Eclipse of the 



moon 3324 



, No horses in America 



in time of 1314 



Infers a continent .... 1579 



, Mechanics of America 



before 2133 



, Scientific spirit of. ... 2533 



.Wheels for vehicles in 



America unknown be- 

 fore 3727 



COMBATIVENESS Inherent 



in man 2398 



, Mental vs. physical . . . 2460 



COMBINATION, Chemical, in 



nature 1845 



against Competition. . . 2474 



, Conduct determined 



by, of motives 73 



, Force of chemical. . . . 1284 



of Intelligence *552 



May perish *551 



for Mutual advantage. 2514 



to Secure result 2892 



of the seemingly in- 

 compatible *553 



.Useful 3520 



, Variable, of invariable 



forces 3602 



COMBINATIONS, Human, 



must act with Nature *554 



Subject to change .... 596 



