102 
The largest number of cases of 
Hoemorrhage (28) occurs at 30-150 inches. 
„ „ Apoplexy (16) „ 30-200 „ 
„ „ Abortion (7) ,, 29-900 „ 
,, ,, Neuralgia (53) ,, 30 150 ,, 
Of Neuralgias also 51 cases occur at 30-000 inches; 50 at 
30-200 inches (29"950 inches being the mean height of the 
barometer.) 
Other charts were exhibited, which had been drawn to 
ascertain whether the extent of barometric oscillation between 
two successive days, had any predisposing influence upon these 
diseases — with respect to hoemorrhage, no such influence could 
be traced; and neuralgias occurred much more frequently 
when the fluctuations of pressure were comparatively small. 
With respect to apoplexy, the enquiry was carried further, 
in consequence of a statement that “ of the number of cases of 
apoplexy which occurred (at Hawarden) in the years 1850 and 
1851, 50 per cent took place on days of decreasing reading 
of the barometer, and 50 per cent on days after such reading.” 
Of 177 cases of apoplexy, 91 occurred with decreasing 
readings, 87 with increasing readings of the barometer; and 
of the 87 cases, 44 occurred on days immediately succeeding 
days of decreasing readings, 43 on days succeeding others of 
increasing readings. 
The sources of error from the influence of warmth or 
moisture were examined, but no effect was traced to these 
causes, except in the case of apoplexy. 
The following- conclusions were drawn from the investi- 
gation : — 1. That a high degree of barometic pressure is 
favourable to the production of neuralgias, less evidently so to 
apoplexies and other hoemorrages, and that abortions are not 
shown to be affected by it. 2. That increasing readings of 
the barometer are as frequently accompanied by cases of these 
diseases as decreasing readings. 3. That a small extent of 
diurnal oscillation of the barometer seems to be favourable to 
