OF MICROSCOPIC OBJECTS. 5) 
Ist DtivIsIon. 
Under our first head may be ranged the following :— 
Acetic acid. 
Liquor potasse and sode. 
Concentrated sulphuric and hydrochloric acids (the latter 
saturated with chlorine). 
Tannin. 
Lime and baryta water. 
Oxalic acid. 
Nitric acid with chlorate of potash. 
Ammonia, 
Alcohol. 
Jodine. 
Glycerine (?) 
Phosphoric acid (tribasic). 
Acetic acid more or less dilute, e.g. one part to five of 
water, after a sufficiently prolonged immersion, renders 
transparent the following tissues, without in general des- 
troying their connective tissue:—some muscles (of the frog 
(Kolliker),) cell-walls generally (not the nucleus), epithelial 
structures, white fibrous tissue. Dr. Beale says that yellow 
fibrous tissue is unaltered by it. Many kinds of formed 
material, sections of preparations which have been hardened 
by alcohol. Dr. Beale also says that it dissolves granular 
matter composed of albuminous materia], and that: many 
tissues are quite insoluble in it, though they are not ren- 
dered opaque by it. Acetic acid renders some tissues trans- 
parent by dissolving out the phosphate or carbonate of lime, 
which they may contain, but it has no similar solvent power 
over oxalate of lime. Parts which are unaffected by this 
acid are then made more conspicuous. 
Liquor potassz and liquor sod act in ek the same 
way, according to the degree of their dilution, but on different 
structures. Albuminous tissues, epithelium, &c., are either 
dissolved by them or rendered so transparent as not to 
obstruct the view of the subjacent structures. 
