Geography of the Air. 63 
A tentative application of the theory during December, 1889, 
has given very encouraging results. The problem can be ap- 
proached in many different ways, but the basis of the solution is 
the determination of the actual energy of the air, both potential 
and kinetic, as well as differences of potential. 
Probably the most important event of the past year to gene- 
ral meteorological students has been the publication of Part I, 
Temperature, and Part II, Moisture, of the Bibliography of 
Meteorology, under the supervision of the Signal Office, and 
edited by Mr. O. L. Fassig. The two parts cover 8,500 titles out 
of a total of about 60,000. This publication renders it now possi- 
ble for any investigator to review the complete literature of 
these subjects, not only with a minimum loss of time, but with 
the advantage of supplementing his own work, without duplica- 
tion, by the investigations of his predecessors. The publication 
is a lithographic reproduction of a type-written copy, the only 
available method, which leaves much to be desired on the grounds 
of appearance, space and clearness. 
The experiments of Crova and Houdaille on Mount Venteux, 
elevation 1,907 metres, and at Bedoin, 309 metres, are of more 
than transient interest since they fix the solar constant at a height 
of 1,907 metres, at about three calories ; agreeing with the value 
obtained by Langley on Mt. Whitney, Cal. 
With this brief allusion to the important phenomena of sun- 
heat, whereon depend not only the subordinate manifestations 
pertaining to this section, but those relating to all other depart- 
ments, this report may appropriately close. 
