100 MICHIGAN ACADEMY OP SCIENCE. 



STRUCTURE OF THE OLFACTORY LOBE OF THE STURGEON. 



BY J. B. JOHNSTON, ANN ARBOR. 



(Read before the Academy, April 1, 1897. Summary, reprinted from Zoological Bulletin, 



Vol. 1, No. 5, p. 240.) 



Summaiy of Re.siilts. 



A. The olfactory lobe: 



(1) In addition to mitral cells of two sorts, six other forms of cells, 

 concerned in receiving- and transmitting- olfactory impnlses. are fonnd in 

 the olfactory lobe. 



(2j The granule cells are provided with axis cylinders and glomerular 

 dendrites, and are therefore nerve cells. 



(3) The olfactory lobe contains cells which are morphologically iden- 

 tical with the cells of Cajal. 



(4) The glomerular zone of the olfactory lobe contains cells with 

 short axis cylinders (associational cells). 



(5) The large mitral cells are provided with non-glomerular dend- 

 rites. 



B. The fore-brain: 



(G) There is in the dorso-median region of the fore-brain a large 

 incompletely differentiated nucleus of cells with shtvi't axis cylinders, 

 constituting an imperfect epistriatum. 



(7) A group of cells is found on the lateral surface of the fore-brain 

 wdiich agrees in position and apparently also in. connections with the 

 cortex lateralis of ReptiJia. 



(8) The cortical region of the fore-luain is connected with the gang- 

 lion habenulae by a tractus cortico-habenularis. A tractus olfacto- 

 habenularis is also present. 



C. The habenular tracts: 



(9) Meynert's bundles do not end in the corpus interpedunculare, but 

 undergo partial decussation there and pass on toward the medulla. 



roiSOXOUS OER]\IS FOUND IN DRINKING WATER. 



BY JULIAN T. McCLYMONDS, M. D., ANN ARBOR. 



(Read before the Academy. April 1. 1S9T.) 

 (Abstract.) 



Since Hippocrates wrote on air, waters and places, water as a cause of 

 disease has been given a prominent place. The tirst experiments proving 

 the correctness of this belief were made by Pasteur, in 1878, when he 

 inoculated animals with polluted w^ater causing death with symtoms 

 of septicemia. Three years later Gaffky carried out similar experi- 

 ments and isolated the bacillus of rabbit septicemia. ^lori in 1888. using 



