Mat 20, 1921] 



SCIENCE 



475 



tion, just as, in Voigt's equation, the first term 

 is independent of H. The orientation is here 

 produced by the rotation, but only the time 

 taken to reach a steady state is affected by its 

 magnitude. The second term, here added to 

 the first, corresponds to Voigt's diamagnetic 

 term. Here we have, except for the small sec- 

 ond term, saturation for even very small values 

 of a 



' If collisions are not absent, or if the mag- 

 netic fields of adjacent molecules and the 

 demagnetizing field become appreciable, the 

 intensity of magnetization will not reach sat- 

 uration; but it will increase with n, being 

 greater for a given value of Q, the greater the 

 mean interval between collisions, the less their 

 violence, and the weaker the field. 



It was suggested by Schuster in 1912 and by 

 Einstein and deHaas in 1915, and earlier by 

 myself, that the behavior of a magnetic mole- 

 cule as a gyroscope might account for cos- 

 mieal magnetism, as the direction of the mag- 

 netization of the earth and sun bear to the 

 direction of the rotation the relation required 

 by the theory. If the theory is quantitively 

 sufficient, the interior of the earth and sun, as 

 pointed out years ago, must be in a very 

 different state from that of bodies with which 

 we are familiar. If m/e reaches enormous 

 values for magnetons within the earth and 

 6un, which is not probable, or if the magneton 

 density is sufficiently high and the effects of 

 collisions and the molecular and demagnetizing 

 fields at the same time sufficiently small, it 

 ia possible that even the small angular veloci- 

 ties of the earth and sim may be sufficient to 

 produce the observed magnetizations.^^ 



S. J. Barnett 



Department of TeseestriaIj Magnetism, 

 Carnegie Institution 



THE AMERICAN ASSOCIATION FOR 

 I THE ADVANCEMENT OF SCIENCE 



SPRING MEETING OF THE EXECUTIVE 

 COMMITTEE 



The executive committee of the council of 

 the association held its regular spring meeting 



25 See papers by Profe^or S. Chapman and by 

 myself in Nature, Nov. 25, 1920, and Marci 3, 

 1921. 



in the Cosmos Club, Washington, D. C, on 

 the afternoon and evening of Sunday, April 

 24. The following paragraphs summarize 

 items lof business that were transacted. The 

 personnel of the executive committee is as fol- 

 lows: 



Simon Flexner (chairman), J. McK. Cat- 

 tell, H. L. Fairchild, L. O. Howard, W. J. 

 Humphreys, B. E. Livingston (permanent sec- 

 retary of the associatioti), D. T. MacDougal 

 (general secretary of the association), E. H. 

 Moore (president of the association), A. A. 

 ISToyes, Herbert O^born, H. B. Ward. All of 

 the members were present at this meeting, ex- 

 cepting Messrs. Flexner, Moore, and Noyes. 

 The meeting was called at 4.00 P.M. 



After the minutes of the last meeting of this 

 committee (Chicago, Dec. 29, 1920) had been 

 read and approved it was voted that the next 

 meeting of the executive committee " shall 

 occur in 'New York City on the first Sunday 

 after ITovember 1 that shaU ibe convenient to 

 a majority of the memibers," the exact date 

 to be arranged by the permanent secretary. 



It was voted that the action thus far taken 

 by the American Association committee on 

 conservation, be approved and that that com- 

 mittee be authorized to proceed with its plans. 

 (The committee on conservation consists of 

 J. C. Merriam (chairman), H. S. Graves, Bar- 

 rington Moore, V. E. Shelford and Isaiah 

 Bowman. It held a meeting in New York 

 City on April 9, jointly with corresponding 

 committees of the National Academy of Sci- 

 ences and the Ifational Eesearch Council, and 

 it was recommended that these three commit- 

 tees form a continuing joint com mi ttee on 

 national conservation, representing the three 

 organizations just mentioned, and that this 

 joint committee be authorized to set up an 

 executive and secretarial agency for the active 

 prosecution of its work.) 



The executive committee ratified the action 

 taken by the committee on honorary life mem- 

 berships through the Jane M. Smith fund, in 

 placing the names of the distinguished sci- 

 entists, J. E. Clark and J. N. Stockwell, re- 

 cently deceased, on the list of honorary life 

 members of the Association. (Both were ac- 



