CONTENTS. 5 



Department Bulletin No. 459. — The Use of Enekgy Values in the 

 Computation of Rations for Farm Animals— Continued : 



The computation of rations— Continued. Page. 



Improvement of a ration 21 



Computing a ration from given feeding stuffs 22 



The choice of feeding stuffs 25 



The compounding of rations 28 



•Bearing on farm management 29 



Department Bulletin No. 460. — The Pine Trees of the Rocky Moun- 

 tain Region : 



Scope of bulletin t. . 1 



Generic characteristics of pines 2 



White pines , 4 



Yellow pines 26 



Key to species ,_ 46 



Department Bulletin No. 46.1. — The Identification of Grasses by 

 Their Vegetative Characters : 



Introduction ; 1 



What is meant by the term "grass" 2 



Characteristics of grasses before the blooming stage 2 



How to use the key in identifying grasses 4 



Analytical key to grass seedlings 6 



Detailed descriptions of 48 seedling grasses 9 



Identification of small-grain seedlings 26 



Analytical key to small-grain seedlings 27 



Detailed descriptions of eight small-grain seedlings 27 



Department Bulletin No. 462. — Irrigation in Florida : 



History 1 



Estimate of total irrigated crops 2 



The need of irrigation in Florida 3 



Water supply available for irrigation 18 



Description of irrigation systems in use in Florida 19 



Summary of irrigation plants in use 46 



Experiments to determine methods for economical irrigation 47 



Soil-moisture tests made in connection with irrigation- 47 



Experiments with low-pressure pipe systems 51 



Some important points in the design and equipment of an irrigation 



plant 58 



Department Bulletin No. 463. — Earth, Sand-clay, and Gravel Roads : 



Location and design 2 



Earth roads 15 



Sand-clay roads 34 



Gravel roads i 45 



• Road maintenance 58 



Appendix : Typical specifications , 63 



Department Bulletin No. 464. — Lessons on Poultry for Rural Schools : 



Introduction 1 



Selecting the flock 8 



Disposing of culls 10 



Poultry houses and yards 11 



Poultry feeding 12 



Winter management of poultry 15 



Poultry diseases and pests 16 



Egg selection 17 



Incubation 18 



Marketing eggs 19 



Brooding of chickens 20 



Preserving eggs 21 



Raising crops for poultry 22 



Summer management of poultry 23 



Supplement 25 



