io6 



THE LOWER PRIMATES 



like capacity, aiding the animal to cling in vertical position. The tail has no 

 prehensile qualities but serves in the general capacity of a steering and 

 balancing organ much as in the tailed monkeys of the old world. 



FIG. y2. TARSIUS SPECTRUM. LEVEL OF THE DORSAL SENSORY NUCLEI. 



CEN, Central Gray Matter; CB, Column of Burdach; CG, Column of GoU; dt, Deiterso-spinal Tract; fle. 

 Dorsal Spinocerebellar Tract; cow. Ventral Spinocerebellar Tract; mf, Mesial Fillet; nb. Nucleus of 

 Burdach; ng, Nucleus of Goll; nr. Nucleus of Rolando; pv, Pyramid; ref, Reticular Formation; rst. 

 Rubrospinal Tract; spt, Spinothalamic Tract; trd. Descending Trigeminal Tract. [Accession No. 210. 

 Section 72. Actual Size, 6X4 mm.] 



The nucleus of Burdach (NB) is considerably larger than the 

 nucleus of GoII. This fact gains considerable weight wlicn tlie cohuiins of 

 Burdach and Goll are contrasted. Tarsius seems to possess a mechanism for 

 sensory conduction more extensive in the representation of its hands and arms 



