Gurney on Chemical Science. 309 



led to offer to your notice, because it gives me an opportunity of 

 stating publicly and unequivocally, that any good which may 

 result to science in general from those discoveries, as well as any 

 credit or advantage that may accrue to me in after-life, from being 

 the agent in these discoveries, is due to my connexion with this 

 Institution, for I will frankly confess to you that but for that con- 

 nexion, it is more than probabh, I should never have been led to 

 make them." 



We must now take leave of Mr. Gurney and of our readers. We 

 recommend the former to waste no more time in original re- 

 searches — no more money in puffing his book ; and before he 

 again tries his hand at a course of lectures, to peruse Mrs. Marcet's 

 " Conversations" and Parkes' Catechism. — The latter are respect- 

 fully informed, that Mr. Gurney's Course of Lectures is printed for 

 Messrs. Whittaker, in Ave-Maria Lane, and may be had at all 

 the Booksellers. 



P. S. We had almost forgotten to mention, that a lecture on 

 the blowpipe is appended to this volume. Its style, as we might 

 expect, is rather more inflated than that of the preceding dis- 

 courses, but in " novelties" it yields to none of them. Among 

 other valuable and original suggestions, we here find a proposal 

 for illuminating our theatres by the light emitted from quicklime, 

 under the influence of what Mr. Gurney elsewhere calls the Ox 

 hydrogen blowpipe. 



II. Supplement to the Comparative Estimate of the Mineral and 

 Mosaical Geologies, relating chiefly to the geological Indications 

 of the Phenomena of the Cave oflurkdale. By the Author of the 

 Comparative Estimate. 



The confidence which we expressed, in our review of Mr. Penn's 

 Comparative Estimate that he would find little difficulty in re- 

 conciling the phenomena of the Kirkdale Cave with his geological 

 interpretation of the Mosaic account of the creation, was not un- 

 founded, and we are happy to find that he has anticipated our ex- 

 pectations, and laid his views before the public in the form of a 

 supplement, without waiting till a second edition of the original 

 volume shall be called for. Mr. Penn informs us in a prefatory 

 note, that, " the following pages were first drawn up, with a view 

 to the extension of the conclusion of chapter 6, part 3 of the Com- 

 paralite Estimate, and to a new chapter immediately to succeed 

 it," in a second edition, but in justice to the purchasers of the 

 first, he has embodied the whole in the present supplemental 

 volume. " The curious and important question to which it re- 

 lates, could not have been anticipated in the first edition, as the 

 work was printed before this new and interesting subject had been 

 fully and distinctly brought before the world." 



