74 THE AMERICAN MONTHLY [March, 



that among the passengers who would be likely to come by the same 

 train with Mr. Clay would be the germs of malarial and typhoid fever. 

 In the spring-time even low powers will show that it is well stocked 

 with amcebas, but we do not suppose that these are injurious to health. 

 — F. Blatichard^ AI.D. 



MICROSCOPICAL NEWS. 



Microscopy at the Columbian Exposition, — A committee has 

 lieen appointed whose duty it will be to arrange for a suitable exhibit 

 of microscopes, micro-organisms and books at the Columbian Exhi- 

 bition. A large room will be provided which will be under the super- 

 vision of the American Society of Microscopists and the local committee, 

 and the co-operation of the other societies will be asked. 



A Bargain List of Microscopes, etc., has been issued by Geo. S. 

 Woolman, ii6 Fulton St., New York, of which he will send a copy 

 to applicants. 



Dr. Chas. P. Pengra, professor of Dental Histology and Microscopy 

 in the Boston Dental College, died in Boston, Jan. 31, 1S92, aged 31 

 years. In 1SS3 he received degree of Phar. Chemist from the Michigan 

 State University. In 1SS4 he assumed the chair of Materia Medica 

 and Botany in the Massachusetts College of Pharmacy in Boston. 



CORRESPONDENCE. 



The White's specimen sent me is superb. — Prof C. P. AlcClintock^ 

 Foj-t Smith, Ark. 



The White's botanical sections are real beauties. — A. F. Bartgcs., 

 Akrofi., Ohio. 



MICROSCOPICAL SOCIETIES. 



San Francisco, Cal. — Wm. E. Loy, Sec'y. 



jfainiary 6, i8g2. — J. C. Spencer, M. D., was elected to member- 

 ship. Ed. M. Ehrhorn presented a complete set of the transactions 

 and bulletins of the State Board of Horticulture. Arthur M. Edwards, 

 M. D., Newark, N. J., presented a report on infusorial earths from 

 the Pacific Coast. 



Henry G. Hanks read an interesting paper on an animal concretion 

 {biliary calculus^, presented to the Society some years ago by Colonel 

 Kinne. The specimen, which is the size of a walnut, of irregular form, 

 was removed from the kidney of a cow. From its golden lustre it was 

 thought to be largely composed of gold dust. The pasture lot where 

 the innocent bovine had fed and thrived suddenly became an object of 

 interest, and the residents of the vicinity concluded that the ground was 

 teeming with the yellow metal. So confident were the old miners that 

 the piece of ground suddenly became valuable in their eyes, and the 

 excitement did not subside until an acre lot which could not have been 

 sold for $50 changed hands at something more than $3,000. 



