186 
ZOOLOGY: M. H. CHAMBERS 
Proc. N. a. S. 
On the 6th day the femoral artery and vein may, as stated above, be 
safely ligated. Hence on the 6th day or earlier the entire circulation of 
the leg is carried on through the newly formed vessels — lymphatic, venous, 
arterial. 
On the 12th day the swelling, which increases during the first week after 
replantation, has about disappeared.*** 
* The complete paper with illustrations will be published elsewhere by Dr. F. L. 
Reichert. 
** I was greatly pleased a few weeks ago to have my attention called by Sir Almroth 
Wright to the following paragraph in his paper entitled: "Introduction to Vaccine 
Therapy:" "Lastly — for it is impossible to mention all the points, streptococcic in- 
fection would appear to be responsible for that swelling of the arm so often seen after 
amputation of the breast — that swelling which finds, as we are told, a perfect explana- 
tion in the 'mechanical blocking of the lymphatics.' " (Nelson Loose Leaf Medicine, 
1920.) 
*** Lantern pictures illustrating the author's latest method of operating for cancer 
of the breast, of the dogs at various periods after the replantations and of skiagrams 
of the injected newly formed arteries were exhibited. 
DEGENERATION AND REGENERATION OF THE LATERAL- 
LINE ORGANS IN AMIURUS NEBULOSUS 
By Mary H. Chambers 
Z001.OGICA1. Laboratory, Radcuff^ College 
Communicated May 31, 1922 
If the nerve innervating the taste buds in the barbels of the catfish is 
cut, the taste buds degenerate (Olmsted, 1920b) in ten to fourteen days. 
Regeneration of the taste buds follows the regeneration of the nerve and 
is completed in about sixty days. The lateral-line organs are related 
anatomically to the lateral-line nerve much as the taste buds are to their 
nerve. Do lateral-line organs degenerate and regenerate as taste buds do? 
The lateral branch of the vagus nerve innervating the lateral-line organs 
was severed in Amiurus. The sense organs are conspicuous structures and 
normally the sensory and supporting cells are easily distinguished. The 
first indications of degeneration appeared on the fourth day after the opera- 
tion at which time the organs began to lose their distinct appearance. The 
sensory cells decreased in size and disappeared, first in the central part of 
the organ, where the nerve enters it, and later peripherally. Fragments 
of sensory cells may be detected for a few days longer, as degeneration in 
the single sense organ progresses. The supporting cells are more persis- 
tent, but by the end of two weeks the whole organ has usually disappeared. 
Regeneration is more complicated than degeneration. If regeneration 
