XX 



to his success as a teacher, a scientific adviser to the practical farmer, 

 and in his profession as a Consulting Chemist generally. 



In August, 1849, after spending about two and a half years at 

 Edinburgh, Dr. Yoelcker was appointed Professor of Chemistry at the 

 Royal Agricultural College, Cirencester ; and from this time began 

 a still more active life of lecturing, writing, and experimenting. His 

 income at the College was small, but he supplemented it by writing, 

 and by analytical work. The articles on chemical subjects in "Morton's 

 Cyclopaedia of Agriculture," from the letter M to the end, were con- 

 tributed by him. 



It was about, or soon after this time, that he contributed papers on 

 various subjects of investigation to some Scotch scientific and agri- 

 cultural journals. For example, to the " Edinburgh New Philo- 

 sophical Journal," " Analysis of the Anthracite of the Calton Hill, 

 Edinburgh;" to the "Annals and Magazine of Natural History," 

 " On the Chemical Composition of the Fluid in the Ascidia of 

 Nepenthes;" "On the Composition of the Ash of Armeria maritima 

 growing in Different Localities, with Remarks on the Geological 

 Distribution of that Plant, and on the Presence of Fluorine in 

 Plants;" "On the Watery Secretion of the Leaves and Stems of the 

 Ice Plant." To the " Transactions of the Highland and Agricultural 

 Society of Scotland," " The Chemical Composition of the Seed of 

 Chenopodium quinoa "Composition of House Coal Soot;" "On 

 Artificial Manures in General and Bone Manure in Particular ;" " The 

 Effects of Burnt Clay as a Manure ;" " On the Comparative Value of 

 White Scottish and Black English Oats ;" and " On the Composition 

 of Rice Meal." 



In 1852 Dr. Yoelcker went to Frankfort to be married, and he 

 returned to Cirencester with his wife. Mrs. Voelcker, four sons and 

 one daughter, survive to mourn his loss. 



In 1855 Professor Yoelcker was appointed Consulting Chemist to 

 the Bath and West of England Agricultural Society, and he held the 

 office up to the time of his death, a period of nearly thirty years. In 

 this capacity he gave lectures at various places from time to time, 

 instituted field and other experiments, conducted much laboratory 

 investigation, and contributed papers to the Journal of the Society. 



In 1852 his first paper in the " Journal of the Royal Agricultural 

 Society of England " appeared. He also contributed one in 1855, one 

 in 1856, and one in 1857. In that year, 1857, he was appointed Con- 

 sulting Chemist to the Society ; and from that time to the date of his 

 death, about twenty-seven years, he contributed one or more papers 

 to every half-yearly number of the Society's Journal. 



For about six years after his appointment as Consulting Chemist 

 to the Society, he still retained his Professorship at Cirencester ; and 

 he availed himself of the opportunities which the College farm 



