752 



4. SUUUA ItAU AND V, ]]. JOHNSON ON TIJL; NEllVOUS 



Graphic veconstniction of tli« sympatliotic pvimonlia in the anterior thoracic region 

 of Sparrows. The cord is viewed from the ventral surface and tiio nicta- 

 nievically arranged dorsal root ganglia are indicated hj' dotted lines. Tho 

 lateral projections arc not iu tlie name i)lane as the cords, and aljovvanco must 

 he made for the necessary foreshortening in their projection. 



A. Sparrow 7 (= 78-lir. chick). Cords continuous with slight swellings 

 and short dorso-lateral processes. 



U. Sparrow a (= 78-hr. chick). Cords continuous with slight swellings 

 and short dorso-lateral processes. 



C. Sparrow 6 (= 84-hr. chick). Swellings and processes much more pro- 

 nounced. 



Notice four mesial commissures and the proliferation at the posterior 

 end which is the region where there exists a close relation between the 

 ssymoathctic and the suprarenal ho<lies. 



