sentences:  A new magnetic observatory opened in 1898 in Agincourt, at that time largely empty fields, (found on later maps on the north end of George Forfar farm east of Midland Avenue near Highway 401 or where Health Canada Protection Branch building resides today) leaving the downtown campus location with its meteorological and solar observation duties.By 1907, new university buildings completely surrounded the observatory; dust from the construction clogged meteorological instruments, and at night electric lighting made astronomical work impossible.The Meteorological Office decided to abandon the site and move to a new building at the north end of campus at 315 Bloor Street West, trading the original Observatory to the University in exchange for the new parcel of land.