226 University of California Publications. [Geology 



ellipse with major and minor axes 100 and 80.8 and take B :y— 

 30° and B:x=20°, the equation of the ellipse gives us that 



/ 79.7 K cos 30 ° x 2 / 79.7 K sin 30° x 2 _ 

 v 100 ' "i" V 80.8 ' " — 



and 



/ 86.9 £ cos 20° ^ 2 /86. 9 g s in 20°x 2 _ 

 V 100 / "V V 80.8 ' ~~ 



7i is the same in both equations. Solving the first equation we 

 get Jf=1.18. Solving the second equation we get iT=1.12. The 

 two values do not check satisfactorily, and emphasize the conclu- 

 sion arrived at from a miscroscopic study of the rock structure, 

 namely, that it is wiser not to draw any conclusions from the 

 study of this specimen. 



University of California, 

 May, 1905. 



