FOREWORD. 



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THIS edition of the Manual of Laboratory Methods 

 represents a complete revision of the first edition. The 

 chapter on special bacteriological methods has been almost 

 entirely revised, with the addition of certain methods w r hich 

 have proved practicable in the Army laboratories. The 

 chapter on sanitary examination of water and sewage has 

 been largely revised. A complete new section on autopsy 

 technique, with directions for preparation and shipment of 

 museum specimens, has been added. Many minor sections 

 have been introduced, taking advantage of the experience 

 gained in the laboratories both in this country and in France. 

 Where a method adopted as a standard by the Central Labo- 

 ratory of the A. E. F. has differed from that used in the Army 

 in this country, both methods are given. Special acknowl- 

 edgment is made to Dr. Donald D. Van Slyke, Dr. William 

 G. MacCallum, Captain Oswald T. Avery and Major Edward 

 T. Tucker, for aid hi the preparation of some of the larger 

 sections. 



THE EDITOR. 



6*76739 



(v) 



