82 General Walker — Error in Spirit-Jevelling operations. [April, 



re-levelled and no error has been detected in it, and this would probably be 

 also found to happen in all the other sections. It is to be remembered that 

 to whatever extent the levels already taken may be influenced by variations 

 of local attraction, or by oblique instrumental illumination, a second mea- 

 surement over the same ground would be influenced to exactly the same 

 extent by the first cause and somewhat similarly by the second, and there- 

 fore would probably close with a similar discrepancy. 



In tlie general reduction of the spirit-levelling operations it will be 

 assumed that the mean sea level, as determined at each tidal station, is the 

 datum to which the spirit-levels should be referred in each instance. Any 

 discrepancies which may be met with on closing a line at a tidal station 

 will be dispersed over the line and treated as errors generated in the level- 

 ling operations. 



2. Description of a new species (?/*Clausiliay?'OWi the Nicohars. — By 

 0. F. YON MoLLENDOEFE, Vice-Cousul foT Germany^ Hongkong. 



This paper will be published in full in the Journal, Part II, for 1882. 



3. Life and Legend of Tson Kliapa. — By Babu Saeat Chunder Das. 



4. Bise and Br ogress of Buddhism in Mongolia. — By Babu Saeat 



Chundee Das. 



5. The Lndian Balhard, and the Arahian Intercourse with India in the 

 ninth andfolloimig centuries. — By Edwaed Thomas, F. R. S. 



The preceding three papers will be published in full in the Journal 

 Part I, for 1882. 



SiE Ashley Eden, in resigning the office of President of the Society, 

 said : As this is the last occasion on which I shall have the pleasure of pre- 

 siding at your meetings, in consequence of my departure from India, I 

 must ask you to let me thank you for the very great honor which you have 

 done me in twice electing me to be your President. I am sensible of the 

 very incomplete and inefficient manner in which I have performed the 

 duties of that office, but I need not assure you that this has not been the 

 result of any indifference on my part to the interests of the Society but of 

 unavoidable circumstances. It so happens that at the time when I am 

 down in Calcutta, and should otherwise be able to preside at your meetings, 

 I am prevented by the numerous engagements of the winter season from 

 attending the Society's meetings as frequently as I should wish to do. I 

 now resign the office to which you did me the honor to elect me, and it will 

 fall to the Council to appoint some one to take my place as President for 

 the remainder of the year. 



