Mr. James McLaren, junior, a former student of the 

 'College, supervises the experiments, such as weighing out the 

 rations and the feeding and weighing of the cows, and carries 

 out the milk testing. The College was fortunate in securing 

 the ready co-operation of Mr. McLaren and his son, to both of 

 whom the success of the work is largely due. 



This pamphlet contains : Reprints of the first report 

 issued by the College in 1903 on variations in the composition 

 of milk; reprints of Oifertoii Bulletins, Nos. 1 to 3 ; soya cake 

 for milch cows ; a reprint of a report of experiments with the 

 milk of newly calved cows at Ofterton ; the composition and 

 manurial value of foods ; daily rations for fattening cattle and 

 milch cows; calf rearing at Newton Rigg; prevention of 

 tuberculosis by open-air treatment; and tests for farmers' 

 milk. 



These reprints and articles have been prepared at the re- 

 quest of the Durham Education Committee, for the use of 

 dairy farmers in the county, as most of the reports are now out 

 of print, and there is a great demand for them. 



In preparing for publication a considerable amount of 

 matter which was not included in the original reports has 

 been added. 



These dairy investigations have aroused great interest, not 

 only in the County of Durham, but throughout the North of 

 England, and in the country generally. The County of Dur- 

 ham has, by the grant which has enabled the College to 

 establish the Offerton Hall Dairy Research Station, made the 

 College scheme of Agriculture Research more complete, and 

 that this work is appreciated by dairy farmers is evident from 

 the great interest taken in it by the Northumberland and 

 Durham Dairy Farmers' Association, and other similar bodies, 

 and also from the large number of inquiries made to the 

 College by dairy farmers and by all interested in dairying. 



Offerton Bulletins 1 and 2 were written by Professor C. 

 Bryner Jones, M.Sc., now of the University College of Wales, 



