328 Proceedings 



Discussion followed by Arndt, who asked Winchell about the fault 

 at Hastings; by Random on the physics of wave propagation in rock 

 and soil; by Norton, who objected to classing faults with smaller veins 

 and joints; while Winchell regarded them as only different degrees 

 of motion of the earth's crust .Thus, after a most interesting meet- 

 ing, the Academy adjourned at 10:10. 



HARLOW GALE, Secretary. 



281th and Annual Meeting, Tuesday, Jan. Sth, 1907, in the New Museum 



Room. 



Vice President Winchell presiding: 25 members and guests present. 



The treasury balance, reported by the Treasurer, Edw. C. Gale, 

 had increased during the year from $223.11 to 242.98, due to a parti- 

 cipation in the admission receipts to the museum. 



The Corresponding Secretary reported: Acquisitions during 1906, 

 making a total of . . . . numbers in the Academy's library. 



The Recording Secretary offered the following memorial: — 



"The Minnesota Academy of Science wishes to make a slight 

 record in memory of our life member, Mr. R. J. Mendenhall, who 

 died Oct. 25th, 1906, aged . . years. Mr. Mendenhall was elected a 

 member of the Academy on Mar. 4th, 187:3, at its first regular meet- 

 ing after its organization. He kept up his active membership until 

 1890, when he became one of our two life members (the other being 

 Bishop McGolrick). His scientific interest is evidenced by his faithful 

 attendance at the meetings for many yeais and by his three papers, 

 read before the Academy, on his entomological and botanical subjects 

 which he loved and lived with during his long and beautiful life. The 

 silent beauty of the flowers, which he cultivated and studied, was a 

 most fitting environment and refiection of his own serene, peaceful, 

 and lovely life." 



Moved by Child, and voted, that this memorial be adopted. 



At 8:30 Mr. A. Jackson, Resident Engineer of the Great Northern 

 Railway, described "The Fillicg-in of the Bryn Mawr marsh Bog" for 

 the new freight yard. Abstract as follows: 



In 1895 it was decided that more room was necessary for the 

 Clearwater freight yard and the only available ground was across the 

 Bryn Mawr swamp. Consequently we determined to fill the same with 

 material from the high cliff at Cedar lake. The steam shovel started 

 work at Cedar lake pit on Aug. 29, 1905. 



The Bryn Mawr bog extends from a point about 400 feet west of 

 Laurel Ave., measured along the tracks as they originally existed, to 

 within a couple of hundred feet of Superior Av, a total distance of from 

 1,200 to 1,500 feet. The bog consists of a peat bed on top, from li^ to 

 7 ft. thick, lying on a stratum of shell formation from 6 to 12 ft. thick, 

 and below this a deep stratum of greasy clay. 



Shortly after the filling-in began soundings were taken with a 

 %-inch sounding rod, such tests being taken about 50 ft. apart, and 



