On Arsenical Pakalysis. 9 



small, pale and indistinctly outlined, without nuclei but with rich pigment 

 and occasionally form only a pale mass of grains without clear outHne. 

 Rounded celles with only a few processes are perhaps most numerous. 



'The white substance. No degenerations are found in the columns ex- 

 cepting in GoWs columns where on both sides uniformly extended degenera- 

 tion is present with considerable increase of connective tissue. 



The motor roots within the cord appear thin, but no distinct 

 sign of degeneration is present. 



Cervical swelling. 

 Grey substance: The cells are here more normal in appearance 

 although atrophy in ones are present. The nerve fibres and columns in 

 the white substance are similar to those in the cervical cord. 



GolUs columns are degenerated. (Fig. 1.) 

 5 cm. above the cauda all the same changes as regards the gang- 

 lion cells as above mentioned seem here to be developed. Otherwise 

 there is no change in either the grey or white substance. In the posterior 

 columns there is no distinct degeneration. In a part of the ganglion 

 cells in the carmine coloured cut the one half or third part seems at 

 times to be considerably paler than the other half. 



4 cm. above the lower end of the cord at the point of exit of the 

 2^^ lumbar nerv. (Fig. 2, 3.) 



There is here on the left side of the grey substance an irregular 

 cavity measuring in height about 1 cm.- and in greatest diameter 1 mm. 

 It lies in the middle of the grey substance, just opposite the commissure. 

 It has uneven, ragged walls, on which a number of red blood-globules 

 are met with [which latter are also found in small microscopical masses 

 scattered about in the surrounding grey substance] and also the debris 

 of tissues. In the neighbourhood there are a number of vessels and 

 fairly near the cavity there are ganglion cells of which some have a 

 rather well-preserved form. The greater number are however rounded 

 and have no processes. Owing to the hemorrhage this left cornu 

 has taken a different form from the right being considerably expanded 

 and has burst through the lateral white substance so that the grey sub- 

 stance extends to the periphery of the cord. Also there are here near 

 the periphery a number of the ganglion cells partly atrophic. Even the 

 ganglion cells in the right half of the medulla are somewhat changed 

 and degenerated or atrophied. (Fig. 4.) 



Nova Acta Reg. Soc. Sc. Ups. Ser. III. 2 



