GENERAL MEETING. 5 
2638p MEETING. JANUARY 381, 1885. 
The President in the Chair. 
Fifty-eight members and guests present. 
The Chair communicated an invitation to the members of the 
Society to attend the ninetieth regular meeting of the Anthropo- 
logical Society, and listen to an address by Major J. W. PowE t. 
Mr. C. E. Dutton finished the communication begun by him at 
the last meeting on 
PRACTICAL GEOLOGY Versus SPECULATIVE PHYSICS, 
and the subject was further discussed by Messrs. Doorirrte, 
Mason, CLARKE, Warp, Watcott, Paut, Taytor, M. BaKkeEr, 
and Roprnson. 
2640 MEETING. FEBRUARY, 14, 1885. 
The President in the Chair. 
Thirty-one members present. 
The Chair announced the election to membership of Messrs. CARL 
Barus, Frank Austin Goocn, and Wiii1Am HAuock. 
Messrs. F. W. Cuarke and J. 8. Ditier made a joint communi- 
cation on 
TOPAZ FROM STONEHAM, MAINE, 
describing the alteration of topaz into damourite. [The paper is 
published in the American Journal of Science, 3d series, Vol. 
XXIX, pp. 378-384.] 
Mr. Witu1Am H. DALL made a communication on 
TWO REMARKABLE FORMS OF MOLLUSKS. 
Mr. Datu described the anatomical features of the remarkable 
Chlamydoconcha Oreutti, of San Diego, California,* which is in fact 
a degraded lamellibranch, in which the shell has become internal 
and functionless, and is no longer adjusted by adductor muscles. 
He also described a remarkable feature which he had just dis- 
covered in Milneria minima, a small California bivalve, belonging 
*The main features of this notice appear in Science, No. 76, Vol. IV, p. 
50, 1884. 
