CONTENTS. 5 



Page. 

 Departmental Bulletin No. 162. — Horticultural Experiments at the San 

 Antonio Field Station, Southern Texas: 



Introduction ' 1 



Climatic conditions of the region 2 



The soil conditions 3 



Scope of the experiments 4 



Variety tests 5 



Summary 25 



Department Bulletin No. 163. — A Field Test for Lime-sulphur Dipping 

 Baths : 



Introductory 1 



Method of executing the test 2 



Utilization of results afforded by the test 6 



Department Bulletin No. 164.— Field Test with a Toxic Soil Con- 

 stituent: Vanillin. 



Introduction 1 



Effect of vanillin on clover in pots 2 



Effect of vanillin on wheat in pots 3 



Effect of vanillin on cowpeas, string beans, and garden peas grown in the 



field ! 4 



Presence of vanillin and its effect in the soil six mouths after application. . 7 



Department Bulletin No. 165. — Quassiin as a Contact Insecticide: 



Introduction : 1 



Chemical literature on quassiin 2 



Extraction of quassiin from solutions 4 



Determination of purity of quassiin used 4 



Insecticidal value of quassiin 5 



Conclusion 7 



Department Bulletin No. 166. — Ophthalmic Mallein for the Diagnosis 

 of Glanders: 



Introduction 1 



Various methods for diagnosing glanders 2 



The ophthalmic mallein test 2 



Report of the American Veterinary Medical Association on the ophthalmic 



test 10 



Conclusion 10 



Department Bulletin No. 167.— Paradichlorobenzene as an Insect 

 Fumigant: 



Introduction 1 



Effects of inhalation of the vapor 1 



Paradichlorobenzene as an insecticide 2 



Diffusion of the vapor 3 



Directions for using •. 3 



How put up and cost 3 



Applicability to various insects 3 



Experiments with paradichlorobenzene as a fumigant 4 



Conclusion , 6 



Chemical and physical properties of paradichlorobenzene 6 



Department Bulletin No. 168. — Grades for Commercial Corn: 



Classification of corn 1 



How the various factors should be determined 2 



Securing a representative sample from the bulk 3 



Mixing samples for detailed analyses 4 



Size of samples 4 



Sieves for screening samples 4 



Moisture tests 5 



Damaged corn 6 



Determination of damaged corn 8 



Foreign material 8 



Cracked corn 8 



Color 9 



