DR. BENJAMIN ALLEN, OF BRAINTREE. 157 done before I left Cambridge and so before I enter'd on practise); neither had I a prospect of an opportunity to perfect. And all my thoughts I offer no otherwise than with submission to better judgment to correct. A very poor apology, surely, for publishing a book written in so slovenly a manner ! It was, no doubt, because Allen recognized the imperfections of his book that, twelve years later, in 1711, he brought out a second edition of it, entitled :— The / Natural History / of the / Mineral-Waters / of / Great Britain ; / to which are added some / Observations / of the / Cicindela or Glow-Worm. / By / Benjamin Allen, Med. Bac. / London: / Printed for the Author and Sold by William Innys, / at the Prince's Arms, in St. Paul's Church - / Yard. 1711. This book was not a mere second edition of the first. It was, indeed, practically a new work, completely re-written and re-arranged. Consequently, it was, as a book, far superior to its author's first very-muddled effort. It was, however, of some- what less local interest, inasmuch as it describes only five Essex mineral springs. Allen's observations upon the glow-worm, so inconsequently thrown in at the end of the book, were inserted, he says,1 "as discharge of a promise made" to Ray. This book also was dedicated to the Earl of Manchester, though it contained a long "Epistle Dedicatory," addressed to Dr. Martin Lister (Physician to the Queen) and Dr. Tancred Robinson, each of whom wrote Allen a brief commendatory letter, which he prints. Of the middle period of Allen's life, from about 1700 to about 1720, we know singularly little. We have seen that, in 1711, he published the work above mentioned ; but this appears to have been his only contribution to the literature of science during the period in question, for his contributions to the Philosophical Trans- actions had ceased for the time. Probably, during these years, professional cares absorbed the whole of his energies, leaving him neither time nor opportunity for the making and recording of observations in Natural Science. Later, however, as he approached old age (and had, perhaps, allowed his professional duties to pass, to some extent, into the hands of an assistant), he commenced, as will be seen, to devote more and more of his time and thoughts to scientific observations. This brings us, then, to the year 1723, in which apparently 1 Mineral Waters, p. 102. The observations themselves have been noticed already (see ante, pp. 150-151).