470 Scientific Notices'^Zoohgy, [Dec* 



in the Table of Equivalents, inserted in the Annals for October 

 Jast. 



Acid, fluoboric 34 



iodic 164 



Ammonia, fluoboratc 61 



iodate 181 



Barium, io<lide 194 



Iridium, cliloride 66 



Manganese, chloride ..,.>,,.... 64 



Mercury, iodide 324 



Soda, tartrate of potash 212 



Zoology. 

 3. Letter from Mr, Dillwyn to Mr, Gray, 



MY DEAR SIR, 



I send you a letter I have just received from Mr. Dillwyn, 

 which may prove interesting to some of your readers. Do me 

 the favour to insert it amongst your Notices. Yours truly, 



J, G, Children, Esq. J. E. Gray. 



DEAR SIR, Athenmm, Nov. 21, \S25. 



In the last breeding season, my gamekeeper at Pentlergare 

 killed a Hen Harrier when sitting on her eggs ; and being in- 

 formed of the circumstance 1 directed him to watch for the 

 arrival of her mate, which was shortly afterwards shot as he 

 alighted on the side of the nest. It proved, as I expected, to 

 be a Ringtail ; and this, as well as many other observations 

 which I have made, is sufficient to dispel the prevailing doubt 

 which you mentioned of these birds being more than the male 

 and female of the same species. 



I am, dear Sir, yours truly, L. W. Dillwyn. 



Miscellaneous. 



4. Private Tuition. 



The Rev. J. B; Emmett, of Great-Ousebum, near Borough- 

 bridge, in Yorkshire, a gentleman well known to our readers 

 by his many valuable papers published at various times in 

 the Annals of Philosophi/, proposes taking three or four 

 pupils to be instructed in every branch of mathematics and 

 philosophy ; their course of study will be the same as that 

 pursued at Cambridge, and elucidated with suitable apparatus ; 

 and those who have sufficiently advanced in mathematical 

 knowledge, will have the use of a complete astronomical ob- 

 servatory ; they will also have the advantage of access to a 

 select library. Candidates for Holy Orders will be instructed 

 in the Classics and Theology. 



5. Developement of Electricity by Muscular Contraction, 

 Since the discovery of electricity, the most distinguished 

 philosophers have concurred in regarding it as the principal 



