Sentence:  The <WSD>sections</WSD> were mounted on cold slides smeared with Haupts ' adhesive ( Johansen , 1940 ) in earlier experiments , and in later experiments with a different mixture of the same components reported by Schramm and Rottger ( 1959 ) . 
Meaning of the word marked with <WSD> tags:  a very thin slice (of tissue or mineral or other substance) for examination under a microscope