192 Journal of Comparative Neurology. 



the left hind foot m sympathy), as if they were wet or otherwise 

 irritated. The shaking was apparently a reflex and was at times 

 almost convulsively violent. It is to be compared with the 

 scratching reflex described by Goltz. 



In contradistinction to Munk, therefore, we find loss of 

 muscular sense a more important and permanent feature than 

 tactile or pressure disturbance, though the extirpated area ex- 

 tended further caudad than in his experiments. It must be ob- 

 served that the area we removed lies farther from the median 

 line than that operated on by Munk and affected directly only 

 his fore limb area, though the depth of the excised portion sug- 

 gests the possibility of an injury of other tracts. 



We are confident, moreover, that many of the contradictory 

 results of experiment are due to proliferating regenerations 

 which supply the lost material in the case of young animals. 



A SIMPLE ALCOHOL FORMULA. 



Students frequently experience difficulty in recalling the 

 proportions in which water should be added to alcohol of vari- 

 ous grades to prepare the stock solutions for hardening grada- 

 tim. The formula given in our guides are singularly and ab- 

 surdly complicated. The following may be suggested: Take 

 as many parts of the alcohol given as the percentage required ; 

 add as many parts of water as the difference between the given 

 and the required percentages. 



Example. Given 70 per cent, alcohol to make 40 percent. 

 Take 40 parts alcohol of 70 per cent, and (70 — 40) 30 parts water. 



