  His older siblings took good care of him, under the Doctor’s watchful eye. Early letters indicate that he and his brother Erasmus were enthusiastic amateur chemists, and after his brother went up to Cambridge their letters were often full of possible experiments, orders to purchase chemicals and equipment for their ‘laboratory’, and discussions of the latest discoveries. This was an obvious enough passion that his classmates nicknamed him ‘Gas’. During summers he helped his father on his rounds to his patients, and when only 16 his father sent him and his brother to Edinburgh for the best medical education Great Britain had to offer. Erasmus needed to move from Cambridge to a proper medical school to complete his medical education, and young Charles was taken out of Shrewsbury School early to accompany his brother to Edinburgh, apparently being prepared to follow in his father’s and grandfather’s footsteps in medicine. The two brothers arrived in Edinburgh in October of 1825. Erasmus left after the first year, leaving his brother on his own during his second year at Edinburgh. 