/*'. Waldo — Contributions to Dynamical Meteorology* 289 



.-trier attention to the actual facts as observed in nature. Be 

 i- particularly gratified to tind an agreement between Borne of 

 his views ami those given by Oberbeck, 

 Sections 2, -"> and (> are of BpeciaJ importance as the topics 



treated therein are seldom written about. Section 7 presents 



the author's idea- of the general circulation : and the main 

 interest in the paper, ><> far as actual results are concerned, will 

 be found centered in this section. The chart of a vertical 



tion of the atmosphere (in the plane of the meridian) in the 

 region of the equator, and extending to a height of 25,000 



meters above the sea level, BUOWS with great clearness the 

 author's ideas concerning the circulation in these important 

 regions. 



Vb. 11. — Dr. Vettin of Berlin lias long been a special obser- 

 ver of the motions of the atmosphere in the upper layers. As 

 a cloud observer he deserves to rank with (dement Ley, the 

 English observer of whom it is said, lie devotes one-third of 

 his entire time to observing the aspects of the clouds. Until 

 the quite recent trigonometrical determinations of cloud eleva- 

 tions and velocities, the long series of observations on the 

 apparent velocities of clouds and their vertical distribution, 

 was the most important carried on by any single observer. 

 The results of these observations have been published in the 

 ( teterr. Zeits. fur Meteorologie, and together with the results of 

 some most interesting experiments relative to the motions of 

 air in a confined space, form the principal earlier meteorologi- 

 cal contributions by the author. The present paper is a con- 

 tinuation of some later work published in the Meteor. Zeitsch. 

 in 1887, and while he gives a resume' of his methods of obser- 

 vation and the cloud formations and projected velocities for 

 various elevations as found by him, yet he devotes most of 

 the paper to the consideration of the very important question 

 of the amount of air actually taking part in the in and out flow 

 which takes place in barometric minima and maxima. Very 

 complete tables are given, for summer and winter, in which 

 the sums of the wind velocities as shown by the upper cirrus, 

 the lower cirrus, cloudlets, the rounded clouds, the lower layer 

 of clouds and the wind (anemometrically observed), are given 

 for the 8 octants of both maxima and minima. The same is 

 then presented for the volumes of air (i. e. the product of the 

 times into the velocitu Then follow tables giving these 



results classified as inflowing or outflowing air. Of special 

 importance are the author's computation of the elevation of 

 the regions of the inflow and outflow of air. This having 

 been previously (so far as I am aware) been made a matter of 

 quite arbitrary assumption in the theoretical considerations 

 made by various writer.-. The final pages of the paper are 



