432 Progress in Science. [July, 1871. 



obtained they are fixed by breathing on the gummed glass. Mr. Woodward 

 mentions, also, that he has used, at Mr. Barrett's suggestion, the lantern he 

 devised for cohesion figures with very satisfactory results. This lantern allows 

 the slide to be horizontal, so that the actual formation of the curves is seen 

 on the screen when the slide is tapped. One of his pupils, Mr. Anderton, 

 used, some years ago, a similar method to that of Dr. Mayer, only instead of 

 shellac as a cementing material, canada balsam was used. 



