﻿CONTENTS 



9 



Page 



Department Bulletin No. 1391. — Rayless Goldenrod (Aplopappus 



HETEROPHTLLUS) AS A PoiSONOUS PlANT: 



Historical introduction 1 



Description of the plant 5 



Experimental work 6 



Typical case of steer No. 851 10 



Typical case of steer No. 589 11 



Discussion and general conclusions 13 



Symptoms 13 



Examinations of urine 14 



Autopsy findings 15 



Microscopic changes in tissues 15 



Toxic and lethal dosage ; 18 



Duration of sickness 20 



Aplopappus a cumulative poison 21 



Transmission of the poison by milk 21 



Effect of exercise on animals 22 



Effect of sterilized plant 23 



Effect of eating grass with the Aplopappus 23 



Destruction of the plant 23 



Summary 24 



Literature cited 24 



Department Bulletin No. 1392. — Cooperative Marketing of 

 Cotton: 



Background of the movement 2 



Contemporary organizations 5 



American Cotton Growers' Exchange 17 



Principles and policies 20 



Methods and practices 33 



Costs and prices 48 



Department Bulletin No. 1393. — The Granary Weevil: 



Introduction 1 



Synonymy 1 



Economic history 3 



Origin and distribution 5 



Nature of injury 7 



Technical description 9 



Life history and habits 14 



Parasites i 29 



Control measures 29 



Summar}' 30 



Literature cited 32 



Department Bulletin No. 1394. — Normal Growth or Range 

 Cattle : 



Location of range 1 



Origin anr] management of the cattle 1 



Individual cattle weights, 1916 to 1924 3 



Average yearly gains 7 



Variations in gains 9 



Summary 11 



Department Bulletin No. 1395. — Bats in Relation to the Produc- 

 tion OF Guano and the Destruction op Insects: 



Economic relations of bats 1 



The Mexican free-tailed bat 2 



Bat caves 4 



General habits of the species 4 



Hibernation 5 



Food habits 6 



Guano deposits 6 



Artificial roosts for bats 7 



Build ings occupied 9 



The Florida free-tailed bat - 10 



Malarial control by bats 10 



Summary H 



