218 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
conducting path without interruption of their continuity, by means of 
loops, rings, or networks. He expressed the belief that there is no 
distinction between the primary sense cell, as seen in the olfactory 
organ, and the so-called secondary sense cells of the ear, since the 
neurofibrillae do not lie upon the surface of the sense cells, but form a 
continuous network within their protoplasm. 
London (:05) made brief mention of pericellular networks at the 
termination of the vestibular nerve. He cited no references to other 
authors in proof of such networks, but gave a single figure based upon 
a preparation made by the Ramon y Cajal method from the ear of the 
mouse. Unfortunately the figure does not represent the conditions in 
sufficient detail to permit of satisfactory judgment as to the real nature 
of the network. London concluded his discussion by expressing the 
opinion that it would be well to abandon the neurone theory and 
substitute the fibrillar theory. 
Kolmer (:055) in a subsequent paper gave an account of further 
investigations, by which he sought to establish his earlier conclusions 
on the broader basis of comparative study. He declared that the 
conditions found in birds and rodents were in accord with those pre- 
viously described, but not those in selachians and teleosts. 
Krause (:05) has taken a very reactionary position upon the subject 
of neurological technique, maintaining that neither the Golgi method, 
intra-vitam staining, nor the more recent reduction methods, have 
brought us any nearer to a knowledge of the facts than we were twenty- 
five years ago as the result of the work of Retzius, with whose figures 
of that early time the recent ones of Krause are in close agreement. 
He has investigated the conditions in the ear of Petromyzon, making 
use of the older methods of fixation, such as the fluids of Flemming, 
Hermann, and Zenker, and staining with Ehrlich-Biondi’s triple stain 
or Heidenhain’s iron haematoxylin. He described the nerve fibres as 
expanding at the bases of the sense cells to form cups, which receive 
the sense cells as an egg cup receives an egg. He maintained that a 
mantle of nervous material surrounds the lower part of the sense cells, 
from which the finest kind of fibres penetrate to the interior of the 
sense cells. He found large and small fibres, as did Ramon y Cajal, 
but no evidence for the free ending of the small ones, which he 
described as terminating at the bases of the sense cells. Obviously 
Krause’s conclusions are in close harmony with those of investigators 
who studied the problem prior to the introduction of the Golgi and 
other special neurological methods. 
London and Pesker (:06) have approached the question from the 
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