PREFACE. 



little book has been written with the 

 J_ purpose of informing people, in simple 

 language, what the real danger is of acquiring 

 serious disease especially consumption by 

 means of dust-laden air, arid how this danger 

 may be avoided. 



It is an unpleasant subject ; but it is one 

 which every one must know something about if 

 he would avoid such physical ills as are much 

 more serious drawbacks to comfortable living 

 than are the temporary mental disquietudes 

 which this book is designed to inflict upon its 

 readers. 



T. M. P. 



131233 



