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PRACTICAL HISTOLOGY. 



[XXV. 



side of the villus quite to the apex of the latter, and the vein a 

 wider vessel descends on the opposite side. There is a dense 

 plexus of capillaries (C) placed close under the epithelial covering. 

 The best figures of the blood-vessels of the intestine are to be found 

 in Mall's paper. 1 



5. Nerve-Plexuses in Intestine. (a.) Gold Chloride Method. 

 Wash the small intestine of a rabbit with normal saline, fill it with 



Villi with Solitary 



blood-vessels. follicle. 



- Muscular coat. 



Fia. 262. Mucous Membrane of Small Intestine (Kabbit), Injected, showing 

 villi and a solitary follicle, x 50. 



lemon-juice or 5 per cent, arsenic acid, and leave it in lemon-juice 

 or acid for five minutes. Allow the juice to escape, wash the gut 

 in water, fill it with i per cent, gold chloride, and place it in J per 

 cent, gold chloride solution (30 mins.). Wash it in water, and 

 keep it in the dark in 25 per cent, formic acid (48 hours). It is 

 now easy to separate the coats of the intestine from each other. 

 Wash in water to remove all the acid, and with a pair of forceps 

 strip off the longitudinal muscular coat (Auerbach's plexus adheres 

 to this) ; it separates quite easily from the circular coat. Preserve 

 what remains. Mount a small part of the longitudinal muscular 

 coat in Farrant's solution. 



(1.) Methylene-Uue Method (p. 284). 



1 " Die Blut- u. Lymph-wege im Diinndarm des Hundes," AWiand. d. math.- 

 phys. Classe d. K. Sachs, Gesell. d. Wissens., Bd. xxiv., 1887. 



