"Dr. Cutbush's course of _Evening Lectures on Chemistry_ will commence early in the second week in November, at the Laboratory in Videl's Court, in Second, near the Corner of Chestnut St." and several months later the following notice was found-- "_LECTURES_ on _THEORETICAL AND PRACTICAL PHARMACY_ "The subscriber, at the solicitation of several medical gentlemen, proposes to give a series of Lectures on the Theory and Practice of Pharmacy, accompanied with the necessary chemical elucidations. "Tickets may be had at 25 South Fourth St. "Price 20 dollars. "JAMES CUTBUSH." This was in the year 1812. Early in 1813, a year after the preceding announcement, there appeared-- "J. Cutbush has the pleasure to announce to the ladies and gentlemen composing his class that the lectures on Chemistry, as well as those which are to follow on Mineralogy and Natural Philosophy, will be given in St. John's Lyceum in a building lately erected at the Corner of Chester and Race, between Eighth and Ninth Sts. "N.B. The next lecture will be delivered this evening (Saturday) when, at the request of several ladies, the nitrous oxide or the exhilarating gas will be exhibited." These announcements exhibit a phase in the development of chemical science which is worthy of pause and reflection. Science subjects had taken hold of many persons in the early years of the Nineteenth Century. Some of them became ardent enthusiasts and missioners in the extension of those subjects. As early as 1808 M. Godon gave lectures on Mineralogy, and in 1810 announced a work of two volumes with a quarto supplement of charts. The science of chemistry also had its advocates. Cutbush was evidently one of them, although not the first. This honor belongs to Dr. Patrick Kerr Rogers, father of William B. Rogers, founder and first president of Massachusetts Institute of Technology and President of the National Academy of Science, of Dr. Henry D. Rogers, the eminent geologist, and of James B. and Robert E.--both distinguished in the chemical field. It was in 1802 that Patrick K. Rogers received his medical degree and embarked upon practice. Having spare time, he began public lectures on the sciences, confining himself from 1807 to chemistry. He was very successful. One of his advertisements as it appeared in the _Aurora_, in 1809, read: "EVENING LECTURES MEDICAL AND CHEMICAL For Gentlemen DR. P. K. ROGERS