Proceedings. xvii 
Marcu 7TH, 1892. 
President Pritchett in the chair, and about 40 members and 
120 visitors present. 
On motion the regular order of business was suspended and 
Prof. Prichett proceeded with the reading of his paper on 
‘* The Progress of Astronomy During 1891.’’ The papercon- ~ 
tained a complete resumé of the work for 1891, and was fully 
illustrated by stereopticon views. 
Marcu 21st, 1892. 
President Pritchett in the chair, 21 members and 4 visitors 
present. Dr. Porter presented an application from the Alpine 
Club to be placed on the Exchange list, which was referred 
to the Council. 
Prof. Engler then read a paper on ‘‘ A Geometrical Con- 
struction for Finding the Foci of the Sections of a Cone of 
Revolution.’’ The paper was referred to the Council for pub- 
lication. 
Prof. Wheeler presented ‘Some Notes on the Glacial 
Drift.” He noted the occurrence of the till-formation or the 
blue-clay boulder bearing formation on West Pine street where 
it occurs for a distance of about 2,000 feet, and a maximum 
thickness of 12 feet. After commenting on this being the 
most southerly known extension of the old glacial ice-sheet, 
he made some remarks on the theories of the ‘* Ice-Age.”’ 
Prof. Pritchett gave a brief resumé of the ‘* History of the 
Sun Spots, Magnetic Storms and Aurorae’’ during the dis- 
turbed period, February 5-17. This consisted chiefly of the 
results of observations at Greenwich and Potsdam near Berlin. 
The group of Sun Spots to which the terrestrial disturbances 
were directly attributed appeared on the East limit of the Sun 
on February 5th, and passed round the West limit on February = 
17th. The total spotted area was 1-350 of the Sun’s visible 
hemi d isthe t group of spots ever photographed | 
at Greenwich. The magnetic. disturbances coincident with 
| enormous: changes in these spots: began on ‘Febraary ry 13th 
