234 ON DEATHS IN THE SOCIETY'S MENAGERIE. [Mar. 20, 



of the lower jaw respectively, an uncommon variation in the 

 ei'uption of supernumerary teeth. 



(2) Portion of the skiill of a Rabbit and skull of a Mouse showing- 

 curved and elongated incisors, due to the fact that these incisors 

 had never met at their cutting-edges. 



(3) Skull of a Borzoi Hound in which the second left premolar 

 had a single fang and the last right permanent molar had a double 

 fang, both conditions being unusual. 



(4) Lower incisor teeth of a Cow and of a Horse, showing 

 irregular growth due to injuries to the symphysis or union of the 

 lower jaw. 



(5) Skull of a Chacma Baboon [Cynocephcdus porcarizis) showing 

 displacement of the left upper incisors, due to an injur}' causing 

 necrosis of the premaxilla. 



(6) Lower jaw of a Highland Ram showing supernumerary 

 last molars on each side, and lower jaw of a Thar {Hemitragus 

 jemlaicus) showing overgrown and elongated molars, due to 

 necrosis in the upper jaw and loss of the corresponding tooth. 



The following papers were read : — 



1. Note on Deaths occurring in the Society's Gardens 

 during 1905. By C. G. Seligmann, M.B., M.R.C.P. 



[Received Marcli 19, 1906.] 



In the annexed table Avill be foiind the causes of death, so far 

 as they could be discovered, of 296 mammals and 218 birds which 

 died in the Society's Gardens and which were submitted to post- 

 mortem examination during the year 1905. In these mammals 

 and birds no cause of death was found in 28 and 36 instances 

 respectively. 



A few words are necessary as to the method of classification 

 adopted in the table. In the first five sections the conditions 

 specified are classified pathologically according- to the anatomical 

 nature of the lesion produced. This arrangement is departed 

 from in Section YI., where, under the heading cerebral tumour, 

 are given two cases which logically belong elsewhere, but which 

 are included here, since pressure on the brain produced the 

 symptoms which caused death. In one of these cases the pressure 

 was due to hydatid cysts, in the other to the growth of what 

 was perhaps a Streptothrix. Under parasites are included only 

 those cases in which it appeared that death was directly brought 

 about by pressure and consequent exhaustion due to the presence 

 of the parasite, which in every case given under this heading was 

 an hydatid. Many other animals had parasites of one sort or 

 anotiaer which apj)eared to have exerted little or no pathological 

 influence. The ninth heading includes a number of birds which 

 it appeared probable their companions had killed or severely 

 injured. 



