CONTENTS. 
Page. 
Introduction 7 
Experiments in a special room 9 
Description of room 9 
Determination of the amount of formaldehyde in the atmosphere of the room. . 10 
Potassium cyanide solution 10 
(a) Absorption in cyanide v. 13 
(&) Absorption in water 14 
Temperature and humidity 15 
Bacteriological methods 16 
Disinfectants authorized by U. S. Quarantine Regulations and the proper 
methods of generating and using same 18 
The different methods of evolving formaldehyde gas 20 
Formalin-permanganate 20 
Diluted formalin-permanganate 30 
Retort without pressure 40 
Autoclave 46 
Sheet-spraying 52 
Generating lamp 56 
Formalin-aluminum sulphate-lime 62 
Experiments in a large, bottle 66 
F ormalin-permanganate method 66 
Percentage of formaldehyde liberated 66 
Percentage of formaldehyde remaining in the residue 67 
Diluted formalin — permanganate method 69 
Drying formaldehyde gas by anhydrous calcium chloride 69 
Humidity and temperature in formaldehyde disinfection 71 
Disinfection of sleeping cars with formaldehyde gas 77 
Formalin-permanganate method 78 
Diluted formalin-permanganate method 96 
Retort without pressure 99 
Autoclave 102 
Generating lamp 105 
Summary and conclusions 109 
( 5 ) 
