92 MARY J. ROSS. 



glandular pits. This is the nearest approach to a correct de- 

 scription anywhere found. Salvioli ('90) and Pilliet ('86) con- 

 sider that the glands are formed by an insinking of the surface 

 epithelium, as a cul-de-sac or vesicle at the base of the crypts 

 or between the "gland processes." Sewall ('79) also described 

 " ovoid cells " lying at the base of these crypts. He said that 

 " the ovoid cells first appear in the deep part of the glands, and 

 in older embryos they may be traced on, assuming more and 

 more their completely developed characters, and becoming more 

 numerous and extending farther up the gland." Instead of this 



r&!%* 



-/ \ : -, 



-^ : "-, 



f .' j - '.- ' :/ ~' " .i 



t -^ * i" ' ~ S6i 



^. M S^> 



* ' - v>rv.', ;;-;;;; . ,-; .:. 



,. ----'.-.. i <* ; . ; .- , , & 

 -'.v'.'-^O,^; i .ftv'. 1 JiO-'-v.:-, 



\-^X*K- *':-, 



>;1!IM ; ^^I 

 .^!vl8SSP 



^^ ^ ' \'t: : .'.;:;:(; J-V 1 ': ' "..' ; .---.r'.V, .*. 



^^ /^^^rA,3 s V* :i ^*^"^-rt 

 f. i/ .-::-::- -'--: 



J^-.W' ^^ 77^*^ "^- ^: 

 - ' :-;vv:::<-:;^ 

 >^!?^..). \^: \ }....- "^X;$pP:,i - 



\/x r '-' ,-:/ ?:.- -. *?^WC'' .-rp-x: v--" '- 



^m->--~'~--^-'"' 

 ^wiSij^M WfmK : J-a 



~^ -V.-? : - r ..:.,. -'f.': : 'i '>'- J " '-;"::'.' ' : ; -" '' 



FIG. 32. Section tlirough fundus of stomach of pig. Formalin, a. , gland anlage ; 

 _/! , fundus of gland which has now, by the further growth of the ' ' primary processes," 

 //., been straightened out so that by looking down on a surface view, it is merely a 

 shallow pit ; ., neck cells; </. later form the duct; <?/., epithelial cells of the sur- 

 face ; sf., secondary process forming on the crest of a primary process. Ob), j 1 ^, 

 Oc. 2. 



being the case, from one of the glands described by him, many, 

 in reality, are formed, as was described above. It appears prob- 

 able that the numerous " transitional forms " he finds between 

 the "ovoid " and " embryonic" gland cells, are the neck cells, 

 which occur at the place of union of the gland fundament 

 and the excretory duct. The neck cells would at this stage be 

 more marked and more numerous, relatively, than could be satis- 

 factorily explained on other grounds. Thus, also, can be ex- 

 plained what appeared to him a " wholly unexpected phenom- 



