﻿4 DEPARTMENT OF AGRICULTURE BULS. L126 L150. 



Department Bulletin No. 1129. — A Physical and Chemical Si 



of Milo SlNd Feterita Kernels: Page. 



Purpose of investigation 1 



Physical properties of kernels 2 



Chemipal composition of kernels '_ 3 



Malting of bafir, milo, and feterita 5 



Summary . 7 



Bibliogra phy S 



Department Bulletin No. 1130. — Significance of Wheat Hairs in 

 Microscopical Examination of Flour: 



Purpose of method 1 



Method 1 



Examination of mill stocks 2 



Examination of commercial flours 4 



Examination of experimental series of flour 6 



Summary 7 



Department Bulletin No. 1131. — The Formation and Pathological 

 Anatomy op Frost Rings in Conifers Injured by Late Frosts: 



Introduction 1 



Review of the literature 2 



General symptoms and macroscopic appearance 5 



Anatomical structure of the frost rings S 



Summary 13 



Literature cited 15 



Department Bulletin No. 1132. — The Results of Physical Tests 

 of Road-building Rock from 1916 to 1921, Inclusive: 



Introduction 1 



Table 1. — Results of physical tests of road-building rock from 1916 



to 1921, inclusive 2 



Crushing strength or compression test 46 



Interpretation of results of physical tests 46 



Table 2. — Results of compression tests of rock made prior to January 



1, 1916 46 



Table 3. — General limiting test values for broken stone 51 



Table 4. — Geographical distribution of rock samples tested from 



January 1, 1916, to January 1, 1922 51 



Department Bulletin No. 1133. — The Freezing Temperatures of 

 Some Fruits, Vegetables, and Cut Flowers: 



Introduction 1 



Freezing points of fruits 3 



Freezing points of vegetables 5 



Freezing points of cut flowers 7 



Recapitulation 7 



Department Bulletin No. 1134. — Self-fertilization and Cross- 

 fertilization IN Pima Cotton: 



Introduction 1 



Vicinism, or natural hybridization, in cotton 2 



Structure of the flower in relation to pollination 12 



Ontogeny of the flower in relation to pollination 16 



Locus of pollen deposition in relation to self-fertilization and cross- 

 fertilization 27 



Relative earliness of arrival of self-deposited and of insect-carried 



pollen 31 



Deposition of self pollen and of foreign pollen by insects 34 



Pollen-carrying insects at Sacaton__ _ _ 36 



Relative compatibility of like and of unlike pollen 38 



Pollen compel it ion as a factor in self-fertilization and cross-fertiliza- 

 tion 42 



Relative completeness of insect pollination at different localities 49 



Seasonal variation,- in relative completeness of fertilization 51 



The inferior fertilization of bagged flowers 53 



Boll shedding in relation to pollination and fertilization 55 



Inbreeding in relation to fertility 56 



Summary 61 



Literature cited . 66 



