392 PRACTICAL ANATOMY. 



corroded, it is to be cleaned by pouring water upon it. This is best 

 done by pouring it in a gentle stream from a tea-kettle till it seems 

 quite clean, yet it "will be afterwards necessary to immerse it in water, 

 and move it pretty briskly, by which means you will be able to wash 

 off a great many small pieces of its substance, and small pieces of broken 

 branches that were entangled when out of the water. 



Of Dry Preparations. 



"While preparations are drying that are afterwards to be varnished, it 

 is necessary to have the parts so disposed that every part may easily be 

 touched with a brush ; for, if this is not attended to, it will very often 

 happen that there will be corners and interstices which it is impossible 

 to touch, but which were easily to have been got at or exposed when 

 dissecting, by the flexibility of the parts. If preparations could be 

 dipped into varnish, it woidd answer better than any other method, but 

 that can hardly be done with large preparations, such as a whole body 

 for the blood-vessels, nor even with a leg or an arm ; and, indeed, these 

 are the preparations which would require this attention most. 



Preparations while drying should never be allowed to freeze, for in 

 that operation the air is let loose or collected into larger parcels, which 

 does not diffuse again in the thawing ; therefore a vast number of small 

 cavities are formed, and of course a vast number of reflecting surfaces 

 like powdered glass, which takes off from the transparency of the pre- 

 paration. 



A part of some considerable size, such as the testicle of a horse, &c, 

 which is to be dried, especially too if it is in the summer, should be 

 particularly prepared for that purpose, independently of the exposition 

 of its parts. The artery should be injected with water till it returns 

 by the veins, and made pretty clear of blood, for blood first tends to 

 putrefy. These should be injected with spirits of wine only, if it is 

 afterwards to be injected with a watery injection; but if to be injected 

 with an oily injection, it should be injected with oil of turpentine after 

 having been injected with spirit, and then it may be injected with the 

 intended injection. The spirit coagulates the juices, which is one 

 method of preventing putrefaction, and permits evaporation. The oil 

 of turpentine also prevents putrefaction, and permits evaporation. 



Colours for dried Preparations. — Those preparations that are to be 

 dried, such as stomachs, intestines, membranes of any kind, and more 

 especially such as are thick in substance, such as hands, feet, &c. either 

 for turpentine or not, — children for the blood-vessels, muscles, arms, legs, 

 — in short any preparation that is to be dried, especially those that do not 



