MEASUREMENTS. 



193 



prior to the imbedding with glycerine and gum, in equal parts, or with 

 a mixture of oil and wax. (See this Manual, p. 1, General methods 

 of investigation, by Strieker, andKlebs, 76.) I consider the gum and 

 glycerine to be unquestionably superior ; though in my experience it 

 is quite superfluous to fill the cavities at all, or at most only with the 

 object of preserving the layer of Corti's membrane. My best prepara- 

 tions, from which the above illustrations are taken, were made from 

 cochleae that had not been filled. Sharp knives are alone required. 



MEASUREMENTS. 



The subjoined table contains the most important measurements of 

 the several parts of the internal ear in Man. I have everywhere 

 given round numbers, since the table is only intended to supply 

 general data. For the sake of comparison a few measurements of the 

 corresponding parts in the Dog and Vesperugo have been added. In 

 computing the numbers of the pillars and hair cells, the length of the 

 lamina spiralis was estimated at thirty millimeters. All the measure- 

 ments, with the exception of No. 2, are given in micromillimeters. 



