482 Scientific Intelligence. 
a, as the preceding ideal section illustrates. 
The question as to feldspar-decomposition (resulting in the 
making of kaolin) being the source of the heat, as urged by Church, 
is discussed, and made the subject of careful experiments by Dr.- 
; the conclusion reached is that the amount of heat thus 
derived is infinitesimal, or not enough to be detected by an appa- 
ratus sufficiently delicate to register 0°001° C. Further it is shown 
that the so-called. clay or kaolin is chiefly pulverized. rock 
of the 
as ig During the past season the professional corps has consis- 
ted of 
sell, assistant geologist ; ohnson, topographer ; and 
Ensign J. B, Bernadon, U. 8. N., general assistant r. Th. 
worth Call of David City, Nebraska, is not permanently connec 
accompanied the field parties for a short time. Mr. Gilbert spent 
a month with Mr. Call in the basins of Humboldt and Pyram 
no Bas : 
topographic sketches of certain local features, especially of ance 
moraines. The Survey has determined to discontinue . 
of the most northern lakes is practically complete, but it has bere 
ound impracticable to carry the work southward at present, °% 
