PAROXYSMAL HAEMATINURIA. 
285 
some of the praemolars do not actually replace temporary 
teeth. The typical number of molar teeth is 7 ; viz. in pla- 
cental Mammals, praemolars 4, true molars 3 ; in Marsupials, 
praemolars 3, true molars 4. When the number falls short of 
this, the deficiency seems to be in the front praemolars and 
the posterior molars. But there are, no doubt, many excep- 
tions, as has been pointed out by Owen himself. The four 
praemolars are rarely all present in Bears; and the missing 
tooth is the second or third. In some Bats, also, one of the 
middle praemolars is very small, and entirely disappears in some 
animals of the group . — British Medical Journal. 
PAROXYSMAL HJEMATINURIA. 
At a recent meeting of the Clinical Society of London, 
Mr. Paget, President, in the Chair, Dr. Pav y read notes of 
a case of paroxysmal haematinuria, and exhibited specimens 
of the urine. The patient, previously in good health, was 
seized, after exposure to cold, with nausea, and passed urine 
porter-like in colour. He was sent to bed, and the urine 
gradually became natural. . Eleven days after he was again 
exposed to cold, and a relapse occurred. The urine in these 
paroxysms contained coloured granules and oxalate-of-lime 
crystals, but no blood-corpuscles and no casts of tubes. Dr. 
Pavy spoke of the affection as one characterised by well-defined 
symptoms quite distinct from ordinary haematuria, and said 
that the attacks always followed exposure to cold. He had a 
characteristic case just then under his care in Guy's Hospital 
(Philip ward, No. 43), who could be visited by members in- 
terested in the subject. 
Dr. Broadbent described a case of the kind. He had 
not found oxalates, and did not attach importance to their 
presence. 
Mr. Gant related an instance which illustrated the effect 
of emotional causes in sometimes giving rise to these 
symptoms. 
Mr. T. Smith spoke of a patient who gets haematinuria after 
eating rhubarb-tart, and in whom it would seem to arise 
from the passage of oxalate-of-lime crystals through the 
kidney. 
Dr. Greenhow remarked that cases are often entitled 
paroxysmal haematinuria which have no right to that appel- 
lation. He had always found oxaluria in cases of this dis- 
ease. It should be noted that it is the colouring matter of 
blood, and not corpuscles, which is met with in true cases, 
