xii TABLE OF CONTENTS 



PART II. SCIENCE OF THE COMMUNITY 



SECTION A. MEANS OF TRAVEL 

 Group A. Travel on Land 



XVI. THE LOCOMOTIVE yK ^^ 'ff TCFA'T V 2 43 



XVII. THE ELECTRIC TROLLEY . . ... . . 257 



XVIII. THE AUTOMOBILE <3DVSri33~" :1 T5LA 1 - 266 



Group B. Travel by Water 



XIX. THE STEAMBOAT AND SUBMARINE . 284 



/GlT 3HT DKITASH 



Grott C. Travel by Air 

 XX. AIRSHIPS AND AIRPLANES *KoH SUT. oxurioi.L III 300 



? Y"J"<? T j IHT./'W "^I/.oK 3 FT VI 



SECTION B. MEANS OF COMMUNICATION 

 XXI. THE TELEGRAPH . fcHHcroX anT '!*: aoKario?* .IV. 318 



XXII. THE TELEPHONE 333 



''ll'/ OH '"IHT VI ''J^ T J2/3I C I C /'OI 1 "') ; - v 

 SECTION C. THE HEALTH OF THE COMMUNITY 



XXIII. THE PUBLIC WATER, MILK, AND FOOD SUPPLY . 347 



XXIV. CONTAGIOUS DISEASES . <-j XA?:*! geuoH- -XL 3 6 5 

 XXV. INSECTS AND DISEASE 394 



XXVI. HEALTH OFFICERS TQI^TOCU-a .a ^0 . .417 

 XXVII. SCHOOL HYGIENE [oiTO3*iI. '! ax. or; 4 26 



SECTION D. COMMUNITY ENTERTAINMENT 

 XXVIII. THE MOVING PICTURES , XOITAI- -fflT- .II- 444 



ttaaaAQ -as iT JIX 



SECTION E. CONSERVATION OF COMMUNITY RESOURCES 



XXIX. PROTECTION OF BIRDS r/r/f r . . . ol- .VW 459 

 XXX. CONSERVATION OF FORESTS . . . rA- .VX 47 8 



