Record. xxix 



February 16, 1903. 



Vice-President Smith in the chair, sixteen persons present. 



Professor A, W. Greeley gave an account of recent 

 experiments on the effects on protoplasm of variations in 

 temperature and in the water content of the cells. It was 

 shown that in the case of certain algae, protozoa, and the 

 eggs of some marine invertebrates, a reduction of temperature 

 gave rise to parthenogenetic spore formation or egg segmen- 

 tation, as was also the case when, by suitable plasmolysis, 

 water was withdrawn from the cells. 



Mr. CM. Prynne, of St. Louis, was elected to active 

 membership. 



March 2, 1903. 



Dr. John Green in the chair, nine persons present. 



Professor F. E. Nipher gave an account of his experiments 

 in the production of ether waves by means of explosions. He 

 is now using a brass tube, six feet long and one and one-third 

 inch in diameter, for the explosive, which is laid in a train 

 from end to end. This tube is placed within a large brass 

 tube, one and three-eighths inch in diameter, which is 

 wound with 25,700 windings of No. 25 copper wire. This 

 coil is connected with a delicate D'Arsonval galvanometer. 

 The coil is placed with its axis in the magnetic meridian. 

 When gunpowder is exploded in the inner tube, the galvano- 

 meter gives indication of a change in permeability of the 

 heated channel within the coil. The results were said to be 

 as yet inconclusive, and the apparatus is to be somewhat 

 modilied with a view to making it more sensitive. 



March 16, 1903. 



Vice-President Smith in the chair, twenty-eight persons 

 present. 



Dr. H. M. Whelpley gave an account of the sacred pipe- 

 stone quarries of the Upper Missouri, illustrating his remarks 



