PLATE 5 



EXPLANATION OF FIGURES 



24 Camponotus queen. Anterior root of the mushroom body, showing the 

 division into four bundles of transversely cut fibers. Oc. 2, obj. D, Zeiss. 



25 Camponotus queen. Anterior root of the mushroom body divided into two 

 bundles, and showing fibers passing to and from the protocerebral core. Oc. 2, 

 obj. D, Zeiss. 



26 Camponotus queen. Section of the stalk of a mushroom body showing 

 the 'decussation,' or origin of the anterior root fibers. Oc. 2, obj. D, Zeiss. 



27 Camponotus worker. Cells from Groups I, II, III, IV of the mushroom 

 bodies. Homog. immers. 1/12, oc. 2, Zeiss. 



28 Camponotus queen. Part of the frontal ganglion. Homog. immers. 

 1/12, oc. 2, Zeiss. 



29 Lasius worker. The nuclei of the cells of one lobe of a mushroom body, 

 showing the Groups I to IV. Oc. 2, immers. 1/12, B. and L. 



30 Camponotus queen. Cells composing the brain sheath. Homog. immers. 

 1/12, oc. 2, Zeiss. 



31 Camponotus worker. A nerve cell from the intercerebral region. Homog. 

 immers. 1/12, oc. 2, Zeiss. 



568 



