1895.] MICROSCOPICAL JOURNAL. 227 



Tk. Mid. .0235 Tk. 



Bk. .0260 .008 (.028) .0235 .0085 



.0215 Ap. .0235 



.028 .0215 .280 ex H. F. 

 Ap. .43 ex .002 



H. PI. D. 



Front Tk. Delivered July 2, 1873 

 .0065 



H. F. Angular Aperture, 178° 



4. R. B. Tolles' memorcandum, July 2, 1873 : "Exam- 

 ined Navicula angulatum with sun-light and 2-inch 

 ocular, a perfect picture, clear of all obstructions. Noth- 

 ing intercepted the view." Observers: " Self and John 

 Green. Afterwards exhibited same to Dr. Harriman and 

 Mr. Wells. Sun clouded over, but a very fine show." 



5. What • the oue-seventy-fifth did for the writer. 

 The acquaintance of Dr. Harriman having been made, he 

 kindly allowed the free use of himself and his one-sev- 

 enty-fifth inch objective, and it was resolved to try to 

 photograph the appearances of human blood in tubercu- 

 losis for the first time in the world. A large practice 

 was relinquished and a residence taken up in Cambridge, 

 Mass., on the ground that a college city must contain the 

 most appreciative and sympathizing medical talent of 

 the highest order, that would rejoice in the solution of 

 this knotty problem and thus aid the desired end. It is 

 pleasant to say that these expectations were realized in 

 such men as Prof. A. P. Clarke, dean of the College of Phy- 

 sicians and Surgeons of Boston, and the Vice-President of 

 the American Medical Association, 1895, Dr. H. 0. 

 Marcy, LL. D., President American Medical Association, 

 1892, Surgeon-General of Massachusetts A, F. Holt, now 

 dead, and others, whose services are hereby gratefully 

 acknowledged. 



Photographs of consumptive blood were taken in 

 1876, with the one-seventy-fifth that verified this mor- 

 phology. 



Copies of these photographs were exhibited at the 



