. Contributions to embryology. Embryology. CYTOPLASMIC STRUCTURES IN THE SEMINAL EPITHELIUM OF THE OPOSSUM. 79 whom the chondriosomes and apparatus are two different things, believes that "en las neuronas adultas, la despolarizacion del aparato de Golgi y su difusion peri- nuclear coincide probablemente con la atrofia y desaparicion de la esfera y cen- trosoma (p. 209)." This opinion is plausible only if, as Cajal himself indicates, it is Hmited to mammals, and further, if it is well understood that "esfera" and "centrosoma" do not mean "centrioles," a c
. Contributions to embryology. Embryology. CYTOPLASMIC STRUCTURES IN THE SEMINAL EPITHELIUM OF THE OPOSSUM. 79 whom the chondriosomes and apparatus are two different things, believes that "en las neuronas adultas, la despolarizacion del aparato de Golgi y su difusion peri- nuclear coincide probablemente con la atrofia y desaparicion de la esfera y cen- trosoma (p. 209)." This opinion is plausible only if, as Cajal himself indicates, it is Hmited to mammals, and further, if it is well understood that "esfera" and "centrosoma" do not mean "centrioles," a confusion which is too often made. As to the non-nervous cells Ramon y Cajal (1914, p. 208), after extensive observations on the apparatus in embryonic, cartilaginous, epidermic, and glandu- lar cells, in odontoblasts and osteoblasts, in fat and goblet cells, subscribes whole- heartedly to my opinion: "Desde las clasicas investigaciones de Ballowitz, efectuadas en el epitelio posterior de la cornea, y confirmadas despues para otros tejidos por numerosos autores (Negri, Pensa, Barinetti, Terni, Perocito, Deineka, etc.,) quedo perfectamente estahlecido que, en toda celula portadora de un reticule endocelular polarizado y concentrado, existe en el centre de este un hueco donde se aloja la esfera atractiva. Numerosos indicio cenfirma- torios de esta conexien hemes consignade tambien nesostros al describir la disposicien del aparato de Golgi en las grandulas, osteoblastos y osteoclastos y durante las fases onto- genicas de las neuronas y corpuscules epitelicos. En este punto suscribimos de buena gana el pensiamento de Duesberg (1914), para quien el aparato de Golgi estaria prunera- mente ligado al sistema de la esfera atractiva " A further confirmation of the same opinion is found in Basile's researches (1914) on the modifications of the apparatus in the renal epithehum after nefrec- tomy. While normally the apparatus is located between nucleus and lumen, after the operatio
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