1 retangular glass slab possibly used by Lister in his microbiological experiments 1 rectangular glass slab possibly used by Lister
6 glass slabs possibly used by Lister in his microbiological experiments 6 glass slabs possibly used by Lister
2 rectangular glass slabs, possibly used by Lister in his microbiological experiments 2 rectangular glass slabs
3 square glass slabs, possibly used by Lister in his microbiological experiments 3 square glass slabs