This Day is published, in royal 4to, Price 31. 3s. in Boards, 



AN INTRODUCTION to PRACTICAL ASTRONOMY; con- 

 taining TABLES, recently computed, for facilitating the Reduction 

 of Celestial Observations ; and a popular Explanation of their Construc- 

 tion and Use. 



By the Rev. W. PEARSON, LL.D. F.R.S. &c. 



Rector of South Kilworth, Leicestershire, and Treasurer to the Astrono- 

 mical Society of London. 



" The labour of an Astronomer, in reducing his observations, is so great, that 

 the construction of convenient Tables is a matter of considerable importance." 



Woodhouse. [Astron. vol. i. p. 285.] 



London : printed for the Author, and sold by Messrs. Longman, 

 Hurst, Rees, Orme, Brown, and Green. 



This day is published, in 8vo, with a Plate and a new Map constructed 

 from the best authorities, price 12s. boards, 



SELECTIONS from the WORKS of the BARON DE HUMBOLDT, 

 relating to the Climate, Inhabitants, Productions, and Mines of 

 MEXICO, with Notes and an Introduction. 



By JOHN TAYLOR, Esq., 

 Treasurer to the Geological Society, &c. 



Printed for Longman, Hurst, Rees, Orme, Brown, and Green. 



This work is intended to communicate information on these interesting 

 subjects, and particularly to those who may be investing Capital in the 

 Mines of New Spain, or to others who may contemplate a residence in the 

 country. Some recent and original communications will be found in the 

 work. 



CATON ON DEBILITY, ILLUSTRATED WITH CASES. 



This day was published, price 3s. 6d., a New Edition of 



PRACTICAL OBSERVATIONS on the DEBILITIES, natural 

 and contracted, of the GENERATIVE ORGANS of both Sexes ; 

 including Remarks on Onanism, Seminal Weakness, Nocturnal Emission, 

 Gleet, Tabes Dorsalis, Fluor Albus, &c. with the Theory of Generation. 



By T. M. CATON, Surgeon, 



No. 6, Not folk-street, Strand ; 



Late of the United Hospitals of St. Thomas and Guy. 



Printed for C. Chapple,59, Pall-mall ; Bo wen, 315, Oxford-street ; Callow 

 and Wilson, 16, Princes-street, Soho ; or by the Author, as above. 



Where may be had, 



Caton on the Venereal Disease and its Consequences, a New Edition, 

 price 5s. illustrated with Cases : A Practical Treatise on the Prevention 

 and Cure of the Venereal Disease, exhibiting the character, symptoms, and 

 treatment of the diseases immediately or remotely connected with it ; con- 

 taining Observations on Gleet, Stricture, Mucal Discharges, the use of the 

 Caustic and common Bougie, Cutaneous Eruptions, Imaginary Venereal 

 Diseases, &c. &c. comprising an Elementary Work for Students, and a 

 Guide to the general Reader ; interspersed with select Prescriptions ap. 

 iblcto each division of the Disease. 



