6 



dieselben. Alle die Zellen stammen vom Mesoderm und ver- 

 mehren sich durch mitotische Teilungen. 



4) Demzufolge besteht die Neuren- oder Neuronenlehre zu Recht. 



5) Was ich hier dargelegt habe, bezieht sich in erster Linie auf 

 die Nervenelemente der Wirbeltiere, ist jedoch sehr wahrschein- 

 lich auch für diejenigen der Glieder tiere und Mollusken 

 gültig. Dagegen folgen offenbar die Nerven der niedersten 

 Tierformen bei ihrer Entwickelung einem einfacheren Plane und 

 sind nicht mit denen der höheren Geschöpfe zu vergleichen. 



Würzburg, 1. Mai 1904. 



Nachdruck verboten. 



Crraniile Cells in the Mucosa of the Pig's Intestine. 



By C. C. Du Bois, A. M. 

 (From the Anatomical Laboratory, University of Missouri.) 



Upon examination of unstained sections of the pig's intestine, 



1 noticed numerous cells with highly refractive granules in their pro- 

 toplasm. In order to determine the nature and distribution of these 

 granule cells the following investigation was undertaken at the sug- 

 gestion of Prof. C. M. Jackson, under whose direction the work was 

 done. 



The material was taken absolutely fresh from the ordinary fattened 

 animals when slaughtered, the animals weighing 125 to 150 pounds. 

 Of the six animals used, all had more or less food in the intestine 

 (one had very little). All were in a normal state except one which 

 had a number of ulcers especially prominent in the large intestine. 

 No peculiarity of the granule cells was noted in this case however. 



Small pieces of the intestine were fixed in the following fluids: 

 absolute alcohol at ordinary temperature ; absolute alcohol boiling, the 

 objects being immersed in the boiling liquid, then set aside for varying 

 lengths of time; alcohol-acetic mixture (glacial acetic acid one part, 

 absolute alcohol two parts) ; alcohol-sublimate-acetic mixture (70 7o 

 alcohol, 100 ccm, glacial acetic acid 5 ccm, corrosive sublimate 5 g) ; 



2 7o potassium bichromate; Zenker's fluid; 10% formalin; saturated 

 aqueous solution of picric acid ; saturated solution of corrosive sublimate 

 containing 0,6^0 sodium chloride; osmic acid V2 % and 1%; Flem- 

 ming's fluid (weak). 



The materials fixed in the above fluids were dehydrated by run- 



