Meanings of lower laboratory in English

He told Littlefield to light the stove in the lower laboratory.

He climbed up to the back windows of the lower laboratory, found one of them unfastened, and let himself in.

At that moment Webster's voice called them away to examine the store-room in the lower laboratory, and after a cursory examination the officers departed.

That Monday morning Webster asked Littlefield a number of questions about the dissecting-room vault, which was situated just outside the door of the lower laboratory.

His attention had fixed itself particularly on the lavatory at the foot of the stairs connecting the upper and lower laboratories.