594 Scientific Intelligence. 
pees on the pressure of aqueous vapor from ice and water. Tak- 
g into consideration the three states, gaseous, liquid and solid, 
the presence of no gas but its own vapor, It has commonly been 
assumed that the curves were tangent to each other at this point, 
so that the rate of increase of the pressure was the same for ice as 
for water. By the principles of thermodynamics, however, Sir Wm. 
Thomson proved that these curves, instead of being tangent, were 
inclined at an angle forming a salient point directed upward, the 
rate of increase of the pressure suddenly diminishing when the ice 
melted and then slowly increasing, the ratio of the inclinations in 
ate eoverd of them. These camtensined rice conse es 
of quartz sand, with numerous angular and subangular blocks 
of — and talcose schist. Many of the bowlders are very large, 
them eg in the bed of the river two sled below Depilto. ™ ost 
. of them were of the Depilto quartz rock and gneiss, and I saw 
Tnany in the unstratified as Se ees near Ocotal fully eight miles from 
r parent rock, al 
pe A 
= 
