[ 46 1 ] 
Received in October, 1767. 
XLV. Of the Increafe and Mortality of 
the Inhabitants of the If and of Madeira. 
By Dr . Thomas Heberden, F. R. S. 
Read Nov. 26, TT T HEN I confider the number of 
Vt people in the Madeira, and the 
Rate of the inhabitants, I know no place more pro- 
per for forming an eftimate of the increafe and 
mortality of mankind, than this ifland j for the 
number of perfons is upwards of 6o,ooo, all of 
whom may be fuppofed to live and die in the fame 
place where they received their exiftence ; the ac- 
ceftion of ft rangers and the egreftion of the natives 
being fo equally inconfiderable, that if the one doth 
not exadtly counterbalance the other, the difference 
may juftly be negledted, as of no confequence in the 
general calculation. 
This has excited my curiofity; and, by myintereft 
with the vicar-general of this diocefe, I have pro- 
cured a furvey from houfe to houfe in each of the 
refpedtive parifhes ; from which, and the parifh 
regifters, I have deduced the adjoined account. 
An Hypothefts. 
The number of perfons in this ifland, in the year 
I 743> W2S 4^ 2 34 °f fevcn years old and upwards, 
o Now 
