1893.] NATURAL SCIENCES OF PHILADELPHIA. 571 



REPORT OF THE PROFESSOR OF HISTOLOGY AND 

 MICROSCOPIC 1 TECHNOLOGY. 



I beu' to report that the work done as Professor of Histology 

 and Microscopic Technology during the year 1893 has embraced 

 the study of the life history of the tubercle bacillus, the thera- 

 peutic effect of its products, the life history of Actinomyces with par- 

 ticular attention to the morphological changes produced by dif- 

 ferent food stuffs, a careful study of the blood from four cases of 

 Beri-Ben and microscopic work on slides of the bacillus of leprosy 

 which I prepared directly from lepers. Verbal communications have 

 been made to the Academy on Actinomyces and Beri-Beri. 



Respectfully, 

 Samuel G. Dixon. 

 Prof, oj Hist, and Microscopic Technology. 



REPORT OF THE CURATOR OF THE WM. S. VAUX 



COLLECTIONS. 



The Curator of the William S. Vaux Collections respectfully re- 

 ports that they are in good condition. Since the last re- 

 port, made to the Academy in 1890, 134 specimens have been added 

 to the cabinet of minerals at a cost of $645.05. A number of these 

 are unusually fine specimens of rare species. 



Since the death of the late Curator, Mr. Jacob Binder, I have 

 added to the mineral collection from Nov. 2, 1892 to the present 

 date Dec. 15, 291 specimens at a cost of $1,411.75. 



The number of specimens in the collection as reported by Mr- 

 Binder Nov. 30, 1890 was 7, 028. He afterwards added 134 to Aug. 

 13, 1892 and since that time I have added 291, making a total of 

 7,450. 



No additions have been made to the archeological collection since 

 1885 and the number of specimens remains the same as then reported, 

 2,940. 



Respectfully submitted by 



Wm. H. Jefferis, 



Curator. 



