Dominion Photograph Gallery of Sarnia, ON

I have found very little information on this studio - the only references I have found are four ads I found in the Sarnia Observer:

Sarnia Observer Oct. 18, 1867 p3

Sarnia Observer Oct. 25, 1867 p3

Sarnia Observer Nov. 1, 1867 p3

Sarnia Observer Jan. 3, 1868 p3

I have five carte de visite photographs taken by the Dominion Photograph Gallery and two more that I suspect may have been taken there, but are not marked.

From the Collection of John Rochon

From the Collection of John Rochon

From the Collection of John Rochon

From the Collection of John Rochon

From the Collection of John Rochon

I suspect that these two photographs were taken by the Dominion Photograph Gallery due to the identical props and floor coverings:

From the Collection of John Rochon

From the Collection of John Rochon

What do you think?  If anyone out there has any additional information regarding this studio, please let me know.