8 DEPARTMENT OF AGRICULTURE, BULLS. 76-100. 



Department Bulletin 96. — The Temperature of the Bee Colony — Con. p age . 



Temperature accompanying the laying of the first eggs 18 



Transition from winter to summer conditions 19 



General phenomena of the summer temperature 20 



Relation of C to the outside temperature 21 



The maxima and minima of C in relation to O 21 



Fluctuations in the hive temperature and the causes 22 



The effect of "Orientation" or "Play flights" 22 



Effects of cluster heat on the temperature below the frames 23 



The effects of storms '. 24 



The effects of transportation on the temperature of the colony 26 



Department Bulletin 97. — Identification of Commercial Fertilizer Ma- 

 terials: 



Introduction 1 



Equipment 2 



Isotropic substances : 3 



Anisotropic substances 4 



Uniaxial substances 6 



Biaxial substances 7 



Optical constants of fertilizer materials 10 



Department Bulletin 98. — The Application of Refrigeration to the 

 Handling of Milk: 



Introduction 1 



Definition of terms 2 



Changes in milk caused by temperature and time 3 



Methods of utilizing refrigeration 41 



Insulation 49 



Estimating the size of refrigerating plants 57 



Approximate cost of producing mechanical refrigeration in small plants. . . 59 



Requirements of refrigerating plants for dairy purposes 63 



Cooling milk on the farm 65 



Maintaining low temperatures during transportation 69 



Cooling milk at receiving stations 72 



Cooling milk in bottling plants 74 



Refrigeration in creameries 78 



Department Bulletin 99. — Tests of Selections from Hybrids and Com- 

 mercial Varieties of Oats: 



Introduction 1 



Parentage of the selections 2 



The sv stem of numbering 3 



Making the selections 4 



Tests at McLean 4 



Tests at the Iowa Agricultural Experiment Station 7 



Tests at the Cornell University Agricultural Experiment Station 11 



Tests at various other experiment stations 18 



Summary 24 



Department Bulletin 100. — Walnut Aphides in California: 



Introduction 1 



The European walnut aphis (Chromaphis juglandicola Kaltenbach) 2 



The American walnut aphis (Monellia caryae Monelli) 19 



The little hickoxy aphis ('Monellia caryella Fitch) 26 



Monellia calif ornica Essig 34 



Naturol control of walnut aphides 35 



Artificial control of walnut aphides 40 



Summary 46 



