E. 8. Holden— Observations of the Transit of Venus. 71 
ity may well be examined in connection with the highly 
altered stratified rocks with associated eruptives’at Mattapan 
in Boston and at northern Hingham. 
iabase.—Dikes are doubtless of frequent occurrence through- 
out the area discussed in this paper, but no search has been 
made for them. South of Quincy avenue, one ten or fifteen 
feet thick runs east and west near the junction of the coarse 
and fine syenites; and nearly in the line of this dike, northeast 
of the avenue, the Braintree syenite is cut by a dike one or 
two inches thick. The dike at the Sheldon & Co. quarry west 
of West Quincy runs N. 60° W., this like the preceding hav- 
fast-westerly direction (prevalent in Hingham and Weymouth 
South of the region under consideration) which belongs to 
Some places in the vicinity of Boston. 
Penn’s Hill is strewn with bowlders of stratified rock. A 
re, Severe nr as 
Arr. VI.— Observations of the Transit of Venus},made at the 
Washburn Observatory, Madison, Wisconsin, 1882, December 
N, 
5-6; by Epwarp S. HoLpg 
Tue Transit was observed at the Washburn Observatory by 
two persons independently, viz: by myself, using the 15-inch 
Clark equatorial, with the aperture cut down to 6 inches ; and 
Y Mr. G. ©. Comstock, assistant in the Observatory, using the 
6-inch Clark equatorial which formerly belonged to Mr. S. W. 
urnham. We were assisted by two of my students, Messrs. 
Conradson and Pennock. It is hardly necessary to say that 
both instruments are of the highest excellence, 
