7. After this business was thus happily concluded, Franklin remained at the court of Great Britain, as agent for the province of Pennsylvania. The extensive knowledge which he possessed of the situation of the colonies, and the regard which he had always shown for their interests, occasioned his appointment to the same office by the colonies of Massachusetts, Maryland and Georgia. His conduct in this situation increased the reputation and esteem in which he was held among his countrymen. 8. Franklin was now in the midst of those friends whom he had acquired by his fame as a philosopher. He was very much sought after by them. Honors from learned societies and colleges were continually heaped upon him. The university of St. Andrew's, in Scotland, conferred on him the degree of doctor of laws. Its example was followed by the universities of Edinburgh and Oxford. His correspondence was sought by the most distinguished philosophers of Europe. 9. Although Franklin was now principally occupied with political pursuits, he found time for his favorite studies. He extended his researches in electricity, and in other interesting subjects of natural philosophy. 10. The tone produced by rubbing the brim of a drinking-glass with a wet finger is familiar to every one. An Irish gentleman, by the name of Puckeridge, by placing on a table a number of glasses of different sizes, and tuning them by partly filling them with water, endeavored to form an instrument upon which he could play tunes. He died before he had completed his invention. Some improvements were afterwards made upon his plan. The sweetness of the tones induced Franklin to try a number of experiments, and he at length formed the instrument which he has called the Armonica. 11. In the summer of 1762 he returned to America. He received the thanks of the assembly of Pennsylvania, "as well for the faithful discharge of his duty to that province in particular, as for the many and important services done to America in general, during his residence in Great Britain." A compensation of five thousand pounds, Pennsylvania currency, was decreed him for his services during six years. 12. During his absence, Franklin had been annually elected member of the assembly. On his return to Philadelphia, he again took his seat in that body, and continued steadily to protect the rights and interests of the people. 13. In December, 1762, great alarm was excited in the province by the following circumstance. Several Indians resided in the county of Lancaster, who had always conducted themselves as friends to the white men. A number of inhabitants upon the frontiers, who had been irritated by repeated injuries, determined to seek revenge on all the Indians who fell in their way.