204 TRANSACTIONS OF SOCIETY. 



tng their covers soldered on air tight, they were con- 

 nected by a large connection stop-cock by perforating 

 the center o( each cover. I wo small sent cocks, one 

 on each can, were also put by the side of the connec- 

 tion ; on the bottom of each can was also soldered a 

 small stop-cock on which could be screwed a glass 

 receiver for lest paper, and the air by passing through 

 a small glass tube was made to impinge upon the test, 

 thus by tilling the top can with water and arranging 

 the test paper the water was allowed to pass through 

 the connection stop-cock into the bottom can, which 

 brought \\\v gallons of atniospheric air in forcible 

 contact with the paper. Then b> reversion bringing 

 the full can at the top the like experiment could be 

 repeated Numerous specimens of aimos[)heric dust 

 and pollen were exhibited at the close of the meeting. 

 Donations to Mitscrnn. — I'eldspar from Newport^ 

 hornstone containing mintite crystals of iron, used by 

 the Indians for arrow heads, from t.!anoe Falls, N. 11., 

 2QO entomological specimens, mostly undetermined 

 species, /;v;^ j. M. Currier ; chlorite slate, and con- 

 glomerate, from Troy, from j. C. Kennedy; one 

 specimen of gold from (iolden Chariot Mine, Siher 

 City, Idaho Terrttor> . frv.u A. I) Miller; apatite 

 from Ontario, phosphate of lime from vicinity of 

 Charleston. S. C. one specimen of Baker Island gu- 

 ano, also lignite, kaolin clay, bog manganese, and 

 hematite from Brandon, from T. //. Hoskins. 



