xlviii Trans. Acad. Sci. of St. Louis. 



November 18, 1895. 



President Green in the chair, twenty-two persons present. 



Dr. N. M. Glatfelter read a paper on the relations of Salix 

 Missouriensis to S . cor data. 



Mr. F. W. Duenckel presented a model of a meteorological 

 instrument invented by Mr. Leonard Hunt and himself, called 

 " the electric sunshine annunciator," briefly explaining its 

 mode of operation in accurately recording the amount of 

 sunshine each day. 



The following persons, resident in St. Louis, were elected 

 active members: — Frank B. Gallivan, H. von Schrenk. 



One person was proposed for active membership. 



December 2, 1895. 



President Green in the chair, twenty-three persons present. 



Dr. H. C. Frankenfield presented a communication on hot 

 and cold waves, and on the deficit in rainfall during the past 

 three years. He spoke of hot waves as being due to low pres- 

 sure areas first appearing in the Northwest and moving east 

 and south, causing warm winds from the South, and disap- 

 pearing on the development of high areas in the Northwest. 

 The accompanying phenomenon of hot winds in the Southwest 

 and West, moving, as a rule, in narrow belts, from one hun- 

 dred feet to half a mile in width, was discussed, and the state- 

 ment made that their cause and limitation were somewhat 

 obscure, but that they were evidently of dynamic origin. 

 With respect to cold waves, it was stated that, as a rule, a 

 low area is followed by a high one, bringing a cold wave with 

 it, but that this is not invariable, a cold wave occasionally 

 not following a low area, and sometimes not attending a high 

 one. The theories as to the source of the cold air were con- 

 sidered, and it wasal-so stated that the most severe cold waves 

 are those in which the preceding low area extends in a long 

 and narrow trough-shaped depression from the northeast to 

 the southwest. In the discussion of droughts, the phenomena 

 were regarded as purely those of the distribution of rainfall, 

 which might reach the normal amount during a year, although 



