444 



Index. 



ERRATA. 



Page 207, line 20 from the top, for 'proxide' read 'peroxide.' 



Page 354, line 15 from the top, for ' dresent ' read ' present.' 



Page 366, line 13 from the top, for ' permangatnate ' read 'permanga- 



nate. 



After the publication of his paper on "Testing the Value of Guns by 

 Firing under Water" (Art. XVII), Dr. H. A. Mott, Jr., published a re- 

 vision of the article, containing changes in a part of its results. These 

 changes in no wise affect the principle involved, or the relative merits of 

 the several weapons as tested ; but by altering the calculation so as to include 

 therein also the common length of the gun-barrels, the tables on pages 175 

 and 176 are materially modified, so as to give results as follows : — 



T. S. Army Rifle.... 

 IT. S. Model Rifle.... 



Sharp's Rifle 



Spanish Model Rifle. 



Soard penetrated at total dis- 

 tance from Cartridge. 



6 feet, ll.jV inches. 



6 " 10f 

 6 " 5| 

 6 " 6i 



Board would be penetrated 

 through Air at — 



5327.78 feet. 



5309.65 " 



4988.95 " 



5037.08 " 



