MEMOIR OF FRANKLIN PLATT 455 



Mr Piatt retired from active work about 1891. In later years he was 

 an invalid and spent his evenings in his apartment, 1820 Chestnut 

 street, Philadelphia. His serious illness began in 1898, when his vision 

 failed so that he could not read. He died suddenly at Cape May, and 

 is buried in Woodlands cemetery, Philadelphia. He was never married. 



Franklin Piatt was a superior man intellectually. He had a phe- 

 nomenal memory, strong prejudices, and was not easily persuadable. 

 He shunned the society of ladies and emotional influences. He was 

 discreet, politic, and calm in judgment, with great power of estimating 

 the relative value of things. In person he was tall and spare, with 

 usually a slight stoop, and of fair complexion. 



Mr Piatt was a member of several scientific societies, and an original 

 Fellow of the Geological Society. Though a member of the Philadelphia 

 Academy of Natural Sciences from 1868 to 1900, he never contributed 

 to its proceedings. Following is the list of his geological writings : 



BIBLIOGRAPHY 



Character of some Sullivan County coals. (Read February 7, 1879.) Proc. Amer. 



Phil. Soc. 

 Reports of the Second Geological Survey of Pennsylvania: 



H. First report on Clearfield and Jefferson counties. 1875. 



H 2. Report on Cambria and Somerset counties (in collaboration with W. G. 



Piatt). 1877. 

 - H 3. Report on Somerset county (with W. G. Piatt). 1877. 

 L. Report on the Youghiogheny coke manufacture (with J. B. Pearse), with 



other reports. 1876. 

 G 3. Report on the coal fields of Potter county. 1880. 

 G 4. Notes on the Tangascootac coal basin. 1880. 



A 2. Report on the causes, kinds, and amounts of waste in mining anthra- 

 cite. 1881. 

 T. Blair county, with atlas. 1881. 

 Sundry special reports in the Annual Report of 1885. 



The presentation of scientific communications was declared in order, 

 and the President called for the first paper of the printed program, as 

 follows ; 



EXPERIMENTAL WORK ON THE FLOW OF ROCKS* 

 BY FRANK D. ADAMS 



[Abstract.] 



That rocks, under the conditions to which they are subjected in Certain parts of 

 the earth's crust, become bent and twisted in the most complicated manner is a 



* This paper is published in extenso in the Philosophical Transactions of the Roys^l Society of 

 London, series A, vol. 195, pp. 363-401, plates 22-25, 



