176 THE MICROSCOPE. 



the careful examinations and the illustrations combine to make this 

 ■a very interesting paper. 



In our opinion, however, none of the papers rank higher than 

 the one on "A Study of Blood", by Prof. Curtis, of Chicago. While 

 we are not prepared, at this time, to place ourselves on record con- 

 cerning the net work of the white blood-corpuscles, yet we do say 

 that the more we investigate the subject, so much the more are we 

 inclined to accept Prof. Curtis' explanation, namely: that it is an 

 ''optical delusion." Again, the paper is of permanent value, because 

 it throws light upon the subject of the small granules found in the 

 blood, and the granular corpuscles themselves. The paper is given 

 in full in this number. The vice-president — now president — ably 

 discusses the question of adjustable or non-adjustable homogeneous- 

 immersion objectives, and he proves that "adjustment of some kind 

 will always be necessary." The society has given us a glimpse of 

 its power; what shall we expect from the Elmira meeting? 



The meeting is called at Elmira, N. Y., August 15th, at 10 a.m., 

 and will continue about four days. The president, Dr. Blackham, 

 has kindly furnished us with an idea of the work to be presented. 

 The following are some of the titles of the papers that have been 

 promised: 



"The Microscopic Organisms in the Niagara river." 



"The Status of the Microscope in Court." 



"The Diatomacre and Entomostracae of Steuben Co., N. Y." 



"On some Subject in [practical Optics." 



"On a new Rotifer." 



"Several papers on adulteration of foods and drugs." 



The president also writes us, that we can confidently expect the 

 report of the committee on eye-pieces. This cannot help but be one 

 of the most valuable papers of the meeting and it will be waited for 

 with great interest. No more competent person could be found in 

 this country to head the committee than Dr. R. H. Ward, of Troy, 

 N. Y. Now that we have a standard "society screw", we can think 

 of nothing more desirable than uniformity in size and nomenclature 

 of eye-pieces. Theoretically we need it, and practically it is a mar- 

 vel how we have tolerated the present evil so long. A favorable 

 report of this committee next August will make the Elmira meeting 

 a grand success and will place every microscopist under lasting 

 obligations to the committee. 



