384 H, Goadhy on the Preservation of Animal Substances, 



makers could easily graduate such bubbles. The whole appara- 

 tus is enclosed in a japanned tin box 1 inch deep, IJ wide and 

 2Jths long, which can be carried in the waistcoat pocket, and 

 costs but little. 



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play of preparations in a public or private coUectioUj they should 

 be well filtered^ and for this purpose they may be passed a great 

 number of times through fine flannel rammed into the nozzle of 

 a large earthen funnel, or once through a filtering machine, or 

 twice or thrice through good filter paper. If the filtration be 

 properly performed, these fluids are remarkably bright, white, 

 and brilliant, far exceeding in this respect any alcoholic fluids. 

 Rough filtration may be satisfactorily effected by once passing 

 through the thick flannel used for a jelly bag ; but if this be not 

 at hand, it is only necessary to allow the fluids to stand quietly 

 in the vessel in which they were made until quite cold, and 

 then carefully pouring off the top, the extraneous matter always 

 found in rock salt will gravitate, especially in the aluminous 

 fluid, which has the property of throwing down any thing 

 which disturbs the transparency of water. Neither of my fluids 



open vessels, glass jars, or even stoppered bot- 



tles, for any length of time, without additional protection 



In open vessels, the water evaporates, and the salt crystallizes 





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to the total destruction of the specimens included. Salt, bein 

 highly deliquescent, the volume exposed to atmospheric influence 

 (the upper portion) becomes greatly diluted when the atmosphere 

 contains moisture and ascends into the neck of a bottle, even 

 around a well ground stopper, by capillary attraction ; it gains the 

 upper surface of the stopper and then descends the sides of the 

 bottle, and will lie as a pool on the shelf on which the bottle rests. 

 As the weather changes, and becomes dry, the salt crystallizes 

 and thus forms a conduit for the fluid the next rainy day, by 

 which it can greatly, and readily, extend its outposts; and by this 

 means, in time, it will pass completely out of the bottle or other 

 vessel. Bladder will not confine it, applied to a glass jar on the 

 plan employed for spirit preparations; and the only plan is to 

 cover the jar with a plate o( flat glass (patent British plate man- 

 ufactured by Messrs. Chance of Birmingham, is the best) and 

 seal it down with the patent marine glue, ^applied to the glass 

 with a hot iron. 



The best, neatest, and readiest mode, in my experience is the 

 plan of my invention, namely: first place in the upper vessel of 

 a small copper glue pot some marine glue cut small ; in the lower 

 vessel, where the carpenter would put water for the careful disso- 

 lution of animal glue, put linseed oil, and then apply heat; the 

 temperature of the boiling oil will dissolve the glue the first, sec- 

 ondj and even a third time, with care ; after this it becomes 

 altered in its properties, and refractory. 



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