One hundred year old house up in toronto ON. Where the floor meets the walls there is a really cold draft. The floor is really cold. The outside of the house is brick and the inside of the house is floor - old maple flooring and walls - old plaster horse hair.

Is there some way of insulating the space between?
Anyone come across this problem?
IT really makes the second floor cold. the first floor has the same problem as well.

any input is appreciated.