MOUNTING AND PRESERVING OBJECTS. 57 



water is a good preserving fluid. It is also recommended for 

 hardening soft tissues, as the brain, liver, &c., for future dis- 

 section. Dr. Vanarsdale, in his introduction to the American 

 edition of Hassall's Microscopic Anatomy, speaks highly of it 

 in this respect. 



One part of naphtha to seven or eight of water is said to be 

 employed by Messrs. Hett, Topping, and others, in their in- 

 jected preparations. 



One part alum to sixteen of water preserves animal structures 

 for some time, though bone is injuriously affected by it. 



A saturated solution of sulphate of zinc is said to preserve 

 animal tissues well, with the advantage of hardening cerebral 

 substance, but it dissolves albumen so as to cloud the liquid. 

 Mr. Straus Durkhein says it destroys all parts of caterpillars, 

 save the teguments, while the perfect insects are well preserved 

 in it. 



Tulk and Henfrey state that 26 drops of creosote in a wine- 

 glassful of distilled water, preserves well, but renders the pre- 

 parations brown. 



Dr. Goadby has devoted much attention to this subject, and 

 has succeeded in supplying to the microscopist a ready, cheap, 

 and effectual means for mounting animal structures with the 

 greatest possible ease and security. Dr. G. received a gold 

 medal from the Society of Arts for his invention. He has 

 kindly furnished me with the following description of his 

 different preserving fluids. 



; A 1. Bay salt (coarse sea-salt), 4 ounces, 

 Alum, 2 ounces, 

 Corrosive sublimate, 2 grains, 

 Boiling water, 1 quart. 



' A 2. Bay salt, 4 ounces, 

 Alum, 2 ounces, 

 Corrosive sublimate, 4 grains, 

 Boiling water, 2 quarts. 



