vi PREFACE: 
It is no new experience that you can explain things 
better by showing them than by writing about them, 
and where I have been allowed to burn candle ends, 
collect Carbon on clean plates, mess tumblers by blowing 
into lime water, dirt shovels with sulphur, make candles 
of fat and do such other things as are described in 
pp. II to 16, everything has seemed intelligible. 
To those who are young enough not to resent a word 
of advice, I would say, do the simple experiments men- 
tioned before attempting to read the book through. 
It will save the time of those who already have 
acquaintance with the chemistry of foods to commence 
at page 25. 
I respectfully commend p. 36 to the consideration of 
those who have the management of public dietaries. 
