RECORDS OF MIJKT/Xas 367 



On suggestion of Professor J. F. Kemp, the chairman appointed a 

 committee of three, Prof. Kemp, Dr. Pacini and Dr, Earle, to draw up 

 and send to Mrs. Thaclier resolutions expressing the thanks and appreci- 

 ation of the Section of Geology of the Xew York Academy of Sciences 

 for the gift of the John Boyd Thacher Park. 



Di-. Berkey, in his paper, covered the sedimentary series and [lie igne- 

 ous series and concluded as follows : 



As a result all of the formations are complex in composition — in part 

 jirimary, in part metamorphic, in part introduced and all the formations 

 are also complex in structure — in part of primary sedimentary- control, 

 in part induced by metamorphism (recrystallization), in part of primary 

 igneous habit, in part a primary structure emphasized by its control over 

 Igneous injections, and in part a purely secondary dynamic effect. 



This paper was illustrated witli lantern slides and was followed by a 

 discussion by Prof. Kemp, Dr. Kunz, Dr. Reeds, Dr. Earle and Mr. 

 Hawkins. 



Prof. Kemp jnx'st'nted in hi'ief Hiiiiimary tlie paper by Alexis A. Julien 

 as follows: Conclusions in this paper are that magnesia, in hydrated-or 

 carbonated condition, and deweylite and sepiolite in colloid form, have 

 always been the only magnesian derivatives from laterite, with tendency 

 to early migration and transport, in virtue of their solubility. 



Antigorite and talc, crystalline and never colloid, have merely served 

 as insoluble fixatives to harden and record the transformations of their 

 mobile and protean predecessors. 



Chrysolite is but a pseudo-fibrous variety of antigorite in fact, a 

 pseudomorph in antigorite after a pseudomorph in deweylite after nemo- 

 lite, the fibrous form of brucite. 



To the list of rock-making minerals, lu'iicite, deweylite and sepiolite 

 need to be added as important accessories. 



This paper has been published as pages 23-38 of this volume. 



Dr. R. B. Earle read a short paper by D. S. Martin as follows : 



Some time ago I received from Mr. John H. Porter of Brooklyn, X. Y., 

 a number of minerals from ISTelson County, Virginia, where he had been 

 engaged in prospecting and mining for some time. Among these were 

 several specimens of black tourmaline which presented some features that 

 to me were novel and peculiar. I asked Mr. Porter if he could obtain 

 any more examples of this form, and have recently received some from 

 him. 



The specimens at first sight present simply the aspect of rather 

 weathered nodules of solid tourmaline the average size of hickor\^ nuts. 

 Many of them are irregular in form but all show a distinctly radiating 



