152 NHW YORK ZOOLOGICAL SOCIETY. 



have been seen, and in general changes hke those found in the 

 brain. The l)lo()d-vessels of the cord, ahiiost without excep- 

 tion, show pronounced alterations, and it is highly probable that 

 these are in a large degree responsible for certain of the degen- 

 erated cells and fibers. The posterior root ganglia have been 

 found to show diseased ganglion cells in some of the cases with 

 a consequent degeneration of the posterior nerve roots. The 

 anterior nerve roots have also occasionally presented degenerated 

 fibers. 



In concluding this summary of the changes found in the cen- 

 tral nervous system, we feel that we can do no better than to 

 quote from the conclusions jjresented in our study concerning 

 cage paralysis in last year's report : 



"It seems evident that 'cage paralysis' as noted by animal men 

 is not a true disease entity, but that it covers many types of 

 paralvsis, mostl\ of spinal origin and probably as numerous as 

 the like conditions in man. 



"From the five cases outlined in this study it seems that the 

 lesions very closely resemble those of similar and well-recognized 

 human diseases.'' 



PRO(]XOSIS. 



This condition can never be accounted less than serious. 

 While a case in its very earliest stage is much more hopeful 

 than one that is far advanced, with bones extensively softened, 

 yet the prognosis as to recovery is always bad. In the earlier 

 and more favorable cases, the disease may apparently be arrested. 

 From the foregoing pathological lesions it is hardly to be ex- 

 pected that healing and regeneration of the extensively altered 

 bones, or of the degenerated nerve tissues, can take place. 



TRF.AT.MI'.Xr. 



In re>])eet to the treatment t(j be recommended and in>titined, 

 we arc of the belief that this can only be enii>lo\ I'll. with any 

 rational hoi)e of benefit, during the perio(| >>\ iiuuhation. and 

 with the anticipator}- ])uri)osc of prevention, li is l)ut seldom, 

 however, that the necessary advantage of this earl\ knowledge 

 of the disease is secured, and when the true nature of the trouble 

 has become apparent it is often too late to resort to the remedial 

 measures which might have been cmploxed in ilie early .stages. 

 We are using freely l)one-dust and linK waUr in the food and 

 water of r)ur cases. These substances being i>raetirall\ oijorless 



