i 3 2 THE MICROSCOPE. 



velopment during artificially induced blood-formation." The 

 principal places of foundation in the pigeon are the osseous medulla, 

 the spleen, the portal system, and the feather-shafts; in the frog, the 

 bony medulla and spleen; in Triton, the spleen, and the lymph sinus 

 near the bladder; in the eel, the spleen and the venal lymph sinus. 

 (The author has overlooked the view, which is the one most 

 plausible to us, that the colored corpuscles are merely nuclei, and 

 not complete cells. His observations seem far from having settled 

 the problem.) — c. s. m., in Science. 



Microscopic Examination of the Brain and Cord of an 

 Epileptic — D. J. Kingsbury {/our. Nerv. and Ment.JDis.,] anuary, 



1883) gives the following results in the histological examination of 

 the brain of a chronic epileptic: In the frontal lobes and around 

 the fissure of Rolando, increase in the cells of the neuroglia, with 

 some obliteration of the perivascular spaces. 



In the horns of Amnion there were, in addition to the above, 

 cloudiness of the neuroglia cells, perivascular spaces scarcely notice- 

 able, and ganglionic cells more granular than usual. Blood vessels 

 dilated. 



In the occipital lobe, dilated vessels, with spots of softening 

 one-fiftieth of an inch in diameter around many of them, and in- 

 crease of neuroglia cells. 



In the ganglia the white matter was full of capillary infarcts 

 not yet having undergone softening, showing distinct masses of 

 blood corpuscles. Ganglion cells swollen, pigmented, highly granu- 

 lar. Some of the vessels had undergone amyloid degeneration. 



In the medulla, increase of the cells of the neuroglia, dilated 

 blood-vessels, swelling and granular condition of the ganglion cells. 



In the spinal cord, increase of the cells of the neuroglia in the 

 columns of Goll, and an occasional infarct or spot of softening. 



The pathological changes in the brain were more marked in the 

 right than in the left side. — Md. Med. Jour. 



Koch's Bacillus. — It has been the fortune of but few to have 

 beheld this microscopical entity, which has been the most fruitful 

 cause of death, and whose alleged discovery has created so much"* 

 commotion in scientific circles. Distinguished microscopists have 

 searched for it in vain and many have denied its existence, one 

 boldly declaring that Koch mistook certain fat crystals for the bacil- 



