On the Third Edition ofJamesorCs System of Mineralogy, 3 1 



the 2Gth Geo. II. cap. 6 ; prior to the passing of vvhch act, no 

 information can he ol)tained as to what regulations were adopted 

 for the due performance of quarantine. 



LiVERPoor.. — 'The officers at this port have not any know- 

 ledge of the plague having had existence in any lazaretto, or 

 other vessel there. The first regular lazaretto was appointed in 

 the year 1815; and previous to that time, and for about forty 

 years before, it was the practice to hire vessels to air enumerated 

 goods on board, and prior to that period, such goods were aired 

 on board the importing vessels. 



Hull. — The officers at this port cannot find recorded in their 

 books, a case of absolute plague in any lazaretto, during the last 

 200 years. 



Hired lazarettos were first employed at this port in the vear 

 1774 ; before which time it was the usage to employ labourer's on 

 board the vessels placed under quarantine, in airing their cargoes. 



IV. On the Third Edition of Professor Jameson's System of 

 Mineralogy. By P.J. Brown, Esq, 



To Mr. Tilloch. 



Sir, — jIaving derived much pleasure from the study of mi- 

 neralogy, I looked forward with some anxiety for the promised 

 third edition of Professor Jameson's System ; indulging the hope 

 that five years experience since the publication of the second 

 would have weaned him, in some degree, from his implicit at- 

 tachment to the external system of Werner ; aad that reflection 

 aided by the extensive opportunities of study which he cannot 

 fail to possess, would have produced a work worthy of the science 

 and of himself. 



On receiving the third edition my expectations were high, 

 when I saw it stated in tlie title page that the minerals were ar- 

 ranged according to the " Natural History method." — As nothing- 

 can be less natural than attending altogether to the external ap- 

 pearances of minerals, without any reference to the nature of 

 their constituent parts, (considering how many adventitious cir- 

 cumstances may and do give rise to considerable varlatfons in 

 their exterior aspects,) I could not but suppose that the "natural 

 history method" consisted in assigning to each individual a place 

 in that situation where its relation to the neighbouring species 

 entitled it to a claim*. 



♦ This principle is the- foundation of the natural methods in zoology and 

 botany; and Sir James Smith most sensibly observes, that it is by the test of 

 Jussieu's arrangement that the validity of any genus in the latter scicnee 

 must be ])roved. It is true that for the purpose^ of general study, nioie 

 particularly with thooc who have not opportunity of catering very deeply 



into 



