CONTENTS. 13 



Annual report of the Porto Rico agricultural experiment station, etc. — Cont'd. 



Agricultural resources and capabilities of Porto Rico — Continued. Page. 



Guava 410 



Pineapples 410 



Cocoanuts 410 



Cacao 411 



Fiber plants 411 



Minor crops 411 



Forestry 412 



Agricultural machinery 412 



Live stock 412 



Insect pests 414 



The scope and purpose of the irrigation investigations of the Office of Experi- 

 ment Stations 417 



Investigations in the arid region 417 



Agricultural and engineering problems 419 



Instruments for measuring water 420 



Legal and social problems 421 



Irrigation laws 421 



Organization of irrigation industries 423 



Irrigation in the subhumid portions of the United States 424 



Irrigation in the humid portions of the United States 425 



Irrigation in the Middle West 425 



Irrigation in the North Atlantic States 426 



Rice irrigation 427 



Irrigation in the insular possessions of the United States 429 



Hawaiian Islands 429 



Porto Rico 429 



The need of early and effective reform of irrigation laws 429 



List of publications of the Office of Experiment Stations on irrigation 432 



Scope and results of the nutrition investigations of the Office of Experiment 



Stations 437 



Historical introduction 437 



Nutrition investigations in the United States 438 



General lines of work 440 



Organization of the work 441 



Work of the Washington office 441 



Work of the Middletown office 442 



Investigations in different States 442 



Alabama 442 



California 443 



Dietary studies 444 



Digestion experiments 444 



Composition of California food materials 445 



Publications 445 



Connecticut 445 



Improvement of apparatus — Bomb and respiration calorimeters. . 446 



Metabolism experiments 447 



Dietary studies 448 



Digestion experiments 448 



Analyses of food materials and determination of heats of com- 

 bustion 449 



Miscellaneous inquiries 449 



Publications 449 



Illinois 450 



Dietary studies 450 



