HINTS TO MICROSCOPISTS. 183 



way contrary to the conclusions of M. Turpin, I am however induced to 

 communicate these few remarks, in order to draw the attention of Eng- 

 lish microscopists to the subject. 



to 



III. ON PRESERVATIVE SOLUTIONS FOR MOUNTING ANIMAL STRUC- 



I TURES. 



By Daniel Cooper, Esq., Surgeon, fyc. 



Goadby's Fluid for mounting Animal Tissues. Mr. Goadby, whose 

 name is familiar to most of our readers, has lately received a gold medal, 

 from the Society of Arts, for his fluid-preparation for preserving animal 

 structures, and thus supplying at once a ready, cheap, and effectual 

 means to the microscopist of mounting animal structures with the 

 greatest possible ease and security, and affording the anatomist and 

 physiologist that which has been for so long a time a great desidera- 

 tum. The following is the receipt for making Mr. Goadby's fluid : 



4 Ounces of Bay Salt. 



2 of Alum. 



4 Grains of Corrosive Sublimate. 



2 Quarts of Boiling Water. 



These ingredients are to be well stirred, and the solution finely filtered. 



Preparations immersed in this fluid are reported to keep their colour 

 well, even those possessing a very delicate rose tint. I have examined 

 the blood- corpuscles, and various other normal and abnormal secretions, 

 which had been preserved for upwards of a fortnight in it, without suf- 

 fering any material alteration either as regards their form or colour. This 

 solution is also applicable for preserving zoological objects generally. 

 When mounting objects for the microscope, provided they are not 

 thick, place a few drops of this fluid upon a piece of glass, on which the 

 object has been previously put, and cover it with a portion of thin glass, 

 wipe at the moment all the superfluous moisture from the edges of the 

 surrounding glass, and by means of a brush apply japanner's gold 

 size, so as to cover the upper and under glass to the extent of the 

 eighth or sixth of an inch all round. By adopting this means, the 

 fluid in which the object is placed is prevented from evaporating, and 

 exercises its preservative influence over the enclosed object. 



The Gannal process for preserving animal structures from decomposi- 

 tion, consists in injecting with, or immersing objects in, a solution of 



