126° The Efias of Oxyds 
in a fetus, and which no one hitherto has been able to 
explain. seabed 
Difeafes of the liver, fuch as fchirrous tumours, &e. 
generally attack people who are more or Icfs corpulent. 
The blood of perfons very plethoric, or very fat, is com- 
monly of a darker colour and more vifcous than that of Jean 
people, which is generally very florid. ‘he means of cure 
afford a very firong argument in favour of this hypothefis 3 
for, though obefity be rarely the fubject of medical treat- 
ment, yet fome phyficians have treated it hke the feurvy, 
with vegetable acids, pulfe, &c. as affording more axygente 
It has been remarked, that people who habitually drink 
cyder are more meagre than thofe who uie beer, porter, or 
oiher liquors of the fame kind. 
There are fome countries, the inhabitants of which are 
in general corpulent, as is the cafe in, Holland, and fome 
parts of England; while in others, as France, for example, 
the greater part of the inhabitants are thin. Does this 
arife from the difference of food, or is it not rather owing 
to the greater or lefs purity of the air? that is to! fay, toa 
greater quantity of oxygen contained in the atmofphere ? 
The above facts appear to explain the diflerent. caufes of 
obefity, and to throw great light on the means of curing 
various difeafes, which have hitherto baffled all the efforts 
of medicine. 
‘ 
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III. On the colouring Matter of vegetable Juices and the Ac- 
tion exercifed on it by metallic Subjiances and thew Oxpdsy 
with a new Prace/s for obtaining Lakes of more intenfa and 
folid Colours. - By Cit) Guyton. Read in ihe National 
. Inftitute 15 Vendem, An. 6. ie ante 
Lisvevs, the ereat naturalift of fie north, fade that 
the red, colour of yegetables'announced. in them. the prefence. 
of anacid. It had beendong obferved, that the juice of the 
flower 
q 
