4 CONTENTS. 



The drug known as piukroot — Continued. Page. 



Minor adulterants - - 48 



Mettiods of distinguishing pinkroot from its substitutes 43 



Orchard grass -- 45 



Introduction 45 



Methods of culture 46 



Seeding - 46 



Mixtures with red clover 47 



Mixtures with other grasses 48 



Life of meadows 49 



Uses and value 49 



Hay 49 



Pasture 50 



Seed 50 



Harvesting the seed crop 51 



Thrashing : 51 



Handling the aftergrowth 52 



Value of the straw 52 



Weeds in orchard grass seed fields 53 



Other grasses in fields intended for seed 54 



Summary 5o 



The effect of copper upon water bacteria - 57 



Introduction - 57 



Resistance of various bacteria 59 



Effect of carbon dioxid on viability of Bacillus coli and Bacillus typhi 64 



Copper sulfate and filtration 69 



Conditions affecting legume inoculation 73 



Introduction ''-^ 



Use of lime - - - '4 



Effect of soil conditions upon bacteria 76 



Effect of heavy inoculation "i^ 



Effect of aeration ^ - - - ^^ 



Associative action of bacteria 82 



Summary 83 



100 



