Miscellaneous Intelligence. 481 
IV. MISCELLANEOUS SCIENTIFIC INTELLIGENCE. 
of Petroleum in the Island of Santo 
7) 
. M. Gass. (Editorial correspondence, dated 
Sto. Domingo, April 20, 1872).—We must add to the known 
ered by deposits of pitch; for half a mile down the now dry bed 
ave 
An attempt was made during the “ oil excitement” of 1865 or 
18 a depression where there are several gas jets, and where, over 
the whole area, there is not a single blade of grass or any other 
Ee itttion. 
and 569, 
2. Terrestrial tism, a measure of the sun’s rate of rotation ; 
Ca, Hornsremy.—The changes in the three elements of terrestrial 
magnetism, viz, the declination, inclination, and horizontal inten- 
‘ity, appear to run in a cycle of 26°33 days. In 1870, the periodic 
change in the declination at Prague was equal to 0°705 sin 
(z +190°20'), « equaling 0 on January, 1870, and 360° on January, 
1871. This oscillation is a little greater at Vienna. 
(24 
tion in the inclination in 1870 was a third that of the ype ee 
and that of the intensity about 24 units in the fourth p: 
Aw. Jour, Sct,—Tump Series, Vor. III, No. 18—June, 1872. 
29 
° 
a 
