104 



Scientific Proceedings (126) 



(2) In the majority of the groups of cases the height- weight 

 indices of the males were above those of the females. However, 

 the differences were so small that their significance is questionable. 



(3) When the cases are arranged in groups according to centi- 

 meter intervals of body length the coefficients of variability in 

 weight of these groups are found to range from 9.5 to 12.0. 

 There is no regular change in the coefficients with increasing 

 body length and no constant sex difference in the coefficient is 

 noted. 



The above conclusions were drawn from a study of the pon- 

 deral index as determined from the average weight for a given 

 length. The difference between this figure and the average of the 

 individual indices for a given length was tested by determining 

 these two values separately for the 50 to 51 cm. group which 

 included 996 cases. In this group the height-weight index of the 

 average height and weight was 25.99 per cent, (metric) for the 

 males and 25.60 per cent, (metric) for the females. The average 

 height-weight index was 26.01 per cent (metric) for the males 

 and 25.60 per cent, (metric) for the females. The average pon- 

 deral index of the males showed a standard deviation of 2.41 

 and a coefficient of variability of 9.27 while that of the females 

 showed a standard deviation of 2.26 and a coefficient of varia- 

 bility of 8.85. 



51 (2011) 



Experimental demonstration of the entire course of four descend- 

 ing tracts 1 by a single alcoholic injection in the mid-brain 



of the cat. 



By A. T. RASMUSSEN. 



[From the Department of Anatomy, Medical School, University 

 of Minnesota, Minneapolis, Minnesota.] 



By trephining a hole 2 cm. in diameter, 1 cm. anterior to the 

 occipital crest and 2 cm. from the median line, and retracting 

 the occipital pole of the cerebral hemisphere of the cat, the su- 

 perior colliculus was exposed and about two drops of 95 per 



1 Fasciculus longitudinals mcdialis, fasciculus teotospiualis, fasciculus 

 rubrospinal, radix mesenccphalica trigemini. 



