.........

On the Mutual Contact of Circles in a Sphere..........

.102

On the Comparison of Spherical Surfaces with one another.........141

On the Principles of Plane Trigonometry......

.165

On the Investigation of such general Propositions as are applicable

to the purposes of Spherical Trigonometry........ ........193

On the Solution of Right-angled and Quadrantal Spherical Tri-

angles.........

.216

On the Solution of oblique-angled Spherical Triangles.................229

On the Computation of Spherical Surfaces........

.244

On the Formation of a Technical Memory for the

Spherical Trigonometry.....

purposes of

...............252

On the Solution of Spherical Triangles by Geometrical Construc-

tions.

.....262

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