PAPER BY PROF. BEZOLD. 



269 



ratio when the cooler component is perfectly dry and the warmer com- 

 ponent perfectly saturated. 



The fifth line shows, under a, the maximum precipitation that is con- 

 ceivable under the last mentioned condition of the components as to 

 humidity as well as the mixing ratio and mixing temperature at which 

 this maximum precipitation is attainable. 



In many cases no precipitation is possible with perfect dryness of the 

 cooler component. In such cases the fourth line is the analogue of the 

 third since it gives the minimum value which the relative humidity of 

 the colder component must exceed if in general precipitation is to be- 

 come possible by mixture. Under these conditions in the nature of the 

 case the fifth line becomes a blank. 



The tables as here given relate only to the two piessures 700 and 400 

 millimetres. Since however these include all altitudes between 080 

 and 5,150 metres, that is to say, those altitudes in which the forma- 

 tion of cloud or at least precipitation proper principally occurs, and 

 since the supplementing of these tables by means of the table given 

 in the appendix is not difficult, I have thought that I might confine 

 myself to these special cases. 



At any rate these will suffice in order to give a general orientation as 

 to the quantities coming into consideration, and therefore the tables 

 themselves are now given, and it need only be stated that the figures 

 must be considered only as approximations, since iu general they are 

 has- d upon the first differential quotients, but occasionally on the second 

 differential quotients of the curve of vapor- pressure, so that very small 

 changes in the experimental data or iu the method of interpolation 

 must make themselves very sensible. 



