152 
CENTRAL VETERINARY MEDICAL SOCIETY. 
The ordinary monthly meeting of the above Society was held 
at 10, Red Lion Square, January 2nd, at 7 p.m., the President, 
E. J. Mavor, Esq., in the chair. 
The Secretary introduced the morbid specimen of the inferior 
maxillary bones shown at a previous meeting by Mr. Clark. The 
tumefied portion had been cut open, showing the internal struc¬ 
ture of each jaw, together with the alveoli and teeth in situ. It 
was demonstrated that there was displacement of the third and 
fourth molars, the fang of the third projecting outwards, that of 
the fourth more directly inwards, each causing a corresponding 
tumefaction. Between the fourth and fifth molars the roughly 
masticated food had forced its way more than in the others, and 
caries of the alveolar cavities had resulted, extending more or less 
through their entire depth; the same disease had also implicated 
the teeth, the nerve pulp.of the third and fourth being particu¬ 
larly affected. In the discussion that ensued it was questioned 
whether the disease was congenital or not. 
The Secretary then read a letter and newspaper extract from 
Mr. Graham Mitchell, V.S., of Melbourne, detailing an equine 
affection very prevalent there among young stock, called “ Osteo 
Porosisa disease chiefly of the nasal organs, characterised by an 
enlargement of the superior maxillary and nasal bones, together 
with enlargement of the joints of the legs and knuckling over at 
the fetlocks, the tumours being composed apparently of lymph, 
bloody serum, and fatty matter surrounding imperfect tur¬ 
binated bones. Other symptoms were those of ordinary rheu¬ 
matism. 
In the discussion that ensued, the President observed, there 
was a similarity in some of the cases of the foals that were till 
lately bred at Willesden paddocks; in these animals, no union 
took place between the epiphyses and apophyses, many of the 
animals showing rheumatic symptoms and knuckling over, 
the cause being due, in his opinion, to a want of phosphates in 
the soil. 
Mr. Moore considered there was some analogy to rachitis in 
the human species. 
Mr. Burrell thought that the disease was a rheumatic affection 
of the cartilaginous portions of the frame, because of there being 
more cartilage in the bones at that time. 
Mr. Hunting said, that in America the disease was called “Big 
Head,” and was described by Professor Varnell as “Osteo Porosis” 
in the Veterinarian; and that Mr. Paget, after making several 
