THE HYGIENIC INFLUENCE 

 OF PLANTS IN BOOMS. 



CHAPTER I. 



INTRODUCTION. 



ENTLE reader, do not be alarmed! 

 If the title of this part of the volume 

 suggests a dry discussion on the 

 chemical properties of plants, or an 

 elaborate disquisition concerning 

 matters philosophic, believe that the Author has 

 no intention of presuming so far on your indul- 

 gence ! The purely scientific aspect of the question 

 to be here discussed shall be very briefly set forth: 

 for, whilst the Author feels that what follows 

 must materially strengthen his 'plea' for Fern 



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