GENERAL SCIENCE. 



479 



Hamilton, (Sir) William, (cont). Campi Phlegrsei. Observations on 

 the volcanos of the two Sicilies. Observations snr les vol cans. . . . 

 Supplement. [Engl. & Fr.] Folio. Naples, 1779. 



Hamilton, (Sir) William Rowan. The first part of an Essay on the 

 theory of Systems of Rays. 4°. Dublin, 1828. 



Supplement to an Essay on the Theory of Systems of Rays. 



4°. Dublin, 1830. 



Second Supplement to an Essay on the Theory of Systems of 



Rays. L 4°. Dublin, 1830. 



■ On the Error of a received Principle of Analysis, respecting 



functions which vanish with their variables. 4°. Dublin, 1830. 



On a general Method of expressing the Paths of Light and of 



the Planets by the Coefficients of a Characteristic Function. 



8°. Dublin, 1833. 



Third Supplement on the Theory of Systems of Rays. 



4°. Dublin, 1833. 



On Differences and Differentials of Functions of Zero. 



4°. Dublin, 1834. 



Theory of Conjugate Functions or Algebraic Couples ; with a 



preliminary and elementary Essay on Algebra as the science of 

 pure time. 4°. Dublin, 1835. 



Abstracts of additional Communications on Quaternions, or on 



a new system of imaginaries in Algebra ; with some geometrical 

 illustrations and with applications to some dynamical questions. 



8°. Dublin, 1846. 



On the Law of the Circular Hodograph, or on a new mode of 



geometrically conceiving and of expressing in symbolical lan- 

 guage the Newtonian Law of Attraction. 8°. Dublin, 1846. 



Researches respecting Quaternions. First series. 



4°. Dublin, 1847. 



Lectures on Quaternions : containing a systematic statement 



of a new mathematical method. 8°. Dublin, 1853. 



Hammen, Ludovicus von. De Herniis : Dissert. Acad. Editio secunda. 



Fol. Gedani, 1679. 



< De Herniis : Dissert. Acad. ; accedunt de crocodilo ac vesical 



mendaci calculo epistola3, et responsiones ad Carol. Drelincurtium. 



12°. Lugduni Batavorum, 1681. 



[Hammer von Purgstall?] Encyklopadische Uebersicht der Wissen- 

 schaften des Orients. See Anonymous : Orientalism. 



Hammond, John, and Warner, S. The Practical Surveyor, containing 

 the most approved methods for surveying of lands and waters by 

 the several instruments now in use, particularly exemplified with the 

 common and new theodolites. Third edition. 8°. London, 1750. 



Hamstead, James. An Essay to explain the Cause of the principal 

 Phenomena in Nature. 8°. London, [1811.] 



Hamy, Ernest T. Crania Ethnica. See Quatrefages et Hamy. 



