299 



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%/i-o 



The cells of the entodermal layer are typically of the colummar 

 and polyhedrad type, though they also vary greatly in shape in 

 dififerent locations. They are arranged in a single layer (Fig, 4). Small 

 apparently stratified areas are found, which are probably due to 

 obliquity of section through folds in the wall. The nucleus is large, 

 centrally or distally situated, stains faintly with basic dyes and con- 

 tains as many as five or six nucleoli. Not uncommonly a cell is found 

 with two nuclei. The 

 cytoplasm is more con- 

 densed distally, it is finely 

 granular but immediatey 

 about the nucleus appears 

 finely reticular. Toward 

 the attached portion the cqU 

 appears much vacuolated ; 

 these vacuoles are probably 

 the remains of fat glo- 

 bules. This conclusion is 

 supported by the fact that 

 most of them have a sharp 

 circular outline. The tissue 

 having been fixed in alco- 

 hol, it was impossible to 

 test for fat with osmic 

 acid. Graf Spee reports 

 a specific fat reaction with 

 osmic acid. Paladino, in 

 accordance with his opinion 

 that these entodermal cells 

 perform a function cor- 

 responding in a measure 

 with that performed by IBx7ao 



liver cells, believes some Fig- 7. a. Section through attenuated portion 



of the rvtonla^mip jrraniilp«? °^ ^""^^ ^""^ ^^^^ showing a blood vessel between 

 OI lue cytoplasmic gianuies ^^^ ^j^^^ ^^^ entodermal layer. Camera lucida, 



to be glycogenic in nature; X 150. B. Upper part of the gland showing cha- 

 u^ f„:i„j u J. 1 racter of the entodermal cells, o mucinous masses; 



he failed, however, to al- ^ ^^, ^,,^,1,3. Camera lucida, X 700. 



ways obtain a "character- 

 istic and positive reaction" with Lugol's solution or tincture of iodine. 

 Characteristic of the cells lining the cavity and the glands, is the 

 invariable presence in the basal portions of compact masses of granules, 



