112 Report on the Field and Feeding Experiments at Woburn. 
Dr. Voelcker's Analyses of Manures — continued. 
bridge Coprolites. 
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XII. — Report on the Field and Feeding Experiments 
conducted at 
Wohurn on behalf of the Royal Agricultural Society of England 
during the Year 1880. By Dr. Augustus Voelckee, F.R.S., 
Consulting Chemist to the Royal Agricultural Society. 
Before reporting the results of the W oburn experiments in 
1880, I would remind the reader that the Stackyard-field, 
situated a distance of about three-quarters of a mile from the 
farm-buildings of Crawley Mill Farm, upon which the greater 
part of the experiments are carried out, is divided into two 
sections. On the smaller of the two, comprising 5J acres, 
2f acres are set aside for the continuous growth of wheat, and 
2f acres for the continuous growth of barley. On the larger, 
comprising 16 acres, the primary object for which the experi- 
ments were instituted is being carried out under the ordinary 
four-course system of cropping. For brevity's sake, the ex- 
periments on these 16 acres are spoken of as the Rotation 
Experiments. 
The systematic experiments on the Stackyard-field were 
begun in 1877, and I have, therefore, to report the results of the 
fourth year field-trials. 
The Experiments on the Continuous Growth of 
Wheat. 
After the harvest in 1879 the land was ploughed on the 15th 
and 16th of October ; drag-harrowed on the 29th of October. 
The mineral manures were sown on plots 4, 5, 6, 8, and 9, 
on the 8th of November, and the dung on plots 10 and 11 was 
applied on the 7th of February, 1880. 
The same kind of seed which was used in the previous 
