ABSTRACTS 



Authors of scientific papers are requested to see that abstracts, preferably 

 prepared and signed by themselves, are forwarded promptly to the editors. Each 

 of the scientific bureaus in Washington has a representative authorized to for- 

 ward such material to this journal and abstracts of official publications should 

 be transmitted through the representative of the bureau in which they originate. 

 The abstracts should conform in length and general style to those appearing in 

 this issue. 



METEOROLOGY. — Summary of the free air data at Mount Weather for 

 the three years, July 1, 1907 to June 80, 1910. Wm. R. Blair. 

 Bulletin Mount Weather Observatory, 4: 25-63. 1911. 



The data consist of the air pressures, air 'temperatures and wind direc- 

 tions observed above Mount Weather in 1013 ascensions, 896 with kites 

 and 117 with captive balloons. Related surface data and weather 

 conditions are also included. 



Air pressures have been used only in the determination of altitudes. 



Air temperatures have been considered in two ways; (1) By months 

 and seasons, (2) According to surface air pressure, by seasons and quad- 

 rants in high and in low pressure areas. For the purpose of this summary, 

 the bounding isobar of the high pressure areas is taken as 764.5 mm. of 

 mercury; of low pressure areas, 759.5 mm. The quadrants are numbered 

 counterclockwise, I being in front of the area and to the left of a line thru 

 the center and lying in the direction of motion of the area. 



Those wind directions observed within areas of high and low pressure 

 have been grouped by octants and distance from the center of the area 

 at levels 1000 meters apart. The octants are numbered in the same way 

 as the quadrants. The wind directions not well within high or low pres- 

 sure areas are tabulated in three groups depending on the location of 

 maximum and minimum pressure with reference to Mount Weather. 



All means are graphically represented besides being tabulated. The 

 number of observations represented in each mean is shown. 



It has been the writer's purpose to group these data so that the con- 

 clusions to be drawn from them would be evident with the minimum 

 amount of comment. In the brief discussion accompanying the tables 

 and diagrams, the distribution of the observations in their respective 

 groups is considered, also the value as normals of the means obtained 



152 



