CONTENT^.., 7 



Department Bulletin No. 670. — The Results ok Physical Tests of Road- 

 building Rock in 1916 and 1917: Page. 



Crushing strength or compression test 1 



Interpretation of results of physical tests 2 



Table I. — -Results of physical tests of road-building rock in 1 91 6 and 1 917 . . 3 

 Table II. — Results of compression tests of rock made prior to January 1, 



1916 24 



Table III. — Geographical distribution of rock samples tested to January 1, 



1918 82 



Table IV.— General limiting test values for broken stone 29 



Department Bulletin No. 671. — The Diagnosis op Bee Diseases by 

 Laboratory Methods: 



Introduction 1 



Laboratory methods 2 



Diseases to be diagnosed 4 



European foulbrood 4 



American foulbrood 8 



Sacbrood 10 



Other abnormal conditions of the brood 11 



Nosema disease 13 



Literature 14 



Department Bulletin No. 672. — The Duck Sickness in Utah: 



Introduction 1 



History in Utah 2 



Reports from other regions 5 



Outline of field work 6 



The duck sickness 7 



Symptoms and description 7 



Areas where sick birds are found 11 



Species affected 11 



Untenable theories 13 



The cause 15 



Remedial measures 18 



Increase of summer water in streams 19 



Drainage of affected areas 19 



Cure of sick birds 20 



Release of banded birds 25 



Department Bulletin No. 673. — Production of Lumber, Lath, and 

 Shingles in 1916: 



Introduction 1 



Total lumber production 2 



Lumber production by classes of mills 3 



Cut and capacity of reporting mills 8 



Lumber production by States 8 



Lumber production by kinds of wood 13 



Lumber production by species 14 



Lath 35 



Shingles 36 



Lumber values 37 



Detailed summary 38 



Department Bulletin No. 674. — Hemorrhagic Septicemia: 



Characteristics 1 



History _ ; 2 



Cause of the disease 3 



Symptoms 5 



Anatomical changes 6 



Diagnosis 7 



Prevention 8 



Treatment 9 



Disinfection of premises 9 



