4 DEPARTMENT OF AGRICULTURE BULS. 976-1000. 



Department Bulletin No. 987. — Handbook of Foreign Agricultural 



Statistics — Continued. Page. 



Mexico . 40 



Netherlands (Holland) 41 



New Zealand 43 



Norway 44 



Poland 46 



Portugal 47 



Rumania 47 



Russia 50 



Spain 53 



Sweden 55 



Switzerland 57 



Union of South Africa 59 



United Kingdom (Great Britain and Ireland) 60 



Uruguay 62 



Hawaii 64 



Philippine Islands 65 



Porto Rico 66 



Weights and measures 68 



Department Bulletin No. 988. — Heat Production of Honeybees in 

 Winter : 



Source of heat in winter cluster 3- 



Outline of the experiment 4 



Discussion of the temperature responses in this experiment 5 



Method of measuring the work done by the cluster 6 



Results obtained in the experiment 8 



Summary . 14 



Department Bulletin No. 9S9. — Pine-oil and Pine-distillate Product 

 Emulsions : Method of Production, Chemical Properties, and Dis- 

 infectant Action : 



Purpose of investigation 1 



Production of pine oils 2 



Chemical composition of pine oils 7 



Examination of known samples 8 



Preparation of pine-oil emulsions 10 



Disinfectant action of emulsions of pine-oil and other pine-distilla- 

 tion products 11 



Conclusions . 14 



Bibliography 15 



Department Bulletin No. 990. — Preliminary Manufacturing Tests cf 

 the Official Cotton Standards of the United States for Color fob 

 Upland Tinged and Stained Cotton : 



Grades of cotton tested 1 



Origin of cotton used 1 



Mechanical conditions 2 



Percentages of waste 3 



Moisture determinations 4 



Strength of yarns . 5 



Manufacturing properties 6 



Bleaching properties 6 



Summary , 11 



Department Bulletin No. 991. — Crop Rotation and Cultural Methods 

 at Edgeley, N. Dak. : 



History of the investigations 1 



Soil 2 



Precipitation 3 



Extent of work and character of the seasons 3 



Results of fall and spring plowing compared 6 



Disking compared with plowing corn ground in preparation for wheat 



and oats 7 



Corn ground compai-ed with small-grain stubble for wheat and oats — 10 



Grain stubble compared with fallow 10 



Corn ground compared with fallow as a preparation for small grains. 12 



