The next No, of this Journal will be published on the first of May 



CONTENTS. 



Page. 



Art. X. Some New Discovei s respecting the Dates on the great 

 Calendar Stone of the Ancient [Mexicans, with Observations 

 on the Mexican Cycle of Fifty-two Yea ; by E. G. Squikr, 153 



XL On the Comparative Value of different Kinds of Coal for the 



purpose of Illumination ; and on Methods not hitherto prac- 

 tised for ascertaining the Value of the Gases they afford ; 

 by Andrew Fyfe, M.D., F.R.S.E., F.R.S.S.A., 



XII. Notes on some Chenopodiacese, growing spontaneously, 

 about the City of New York ; by John Carey, 



XIII. Analysis of the Braunau Meteoric Iron ; by Dr. N. W. 

 Fischer, - - - - - 



XIV. On the Acid Springs and Gypsum Deposits of the Onon- 

 daga Salt Group ; by T. S. Hunt, - 



XV. On the Fundamental Principles of Mathematics; by Pro- 

 fessor Stephen Alexander, 



XVI. Notes on the Geology of Charleston, S. C. ; by F. S 



Holmes, ......... 



XVII. Description of two Reptiles from Oregon ; by Mr. Avery J. 

 Siulton, (With a plate.) 



XVIIL Range of the Gtitta Taban Collectors, and present amount 



of Imports into Singapore, .-..-- 



XIX. Application of the Gah nic Circuit to an Astronomical 



ock and Tele aph fl< ster in determining ! I diffei 



U and in astronomic il ol it ions gen- 



ences of longitud 



eralh in a communication J ears C. V r, Assistant 



XX. 



U.S. S addr 

 . Coast Stir 



p 



to Prof. A. I). I he, LL.D., Supt. 







Holism of tl 



i ii 



ih 



■ 



of 



ozoic Formations \orth America, 



T 1 



J by Ed. d ;enj il, translated, 



v s anno! on by Jam Hall, - 

 XXI ral Rule for Involuti md Evolution by Logarithms : 



k 7 I J- L- RlDDELL, M.D., 



by 



^ 



i of a ries of I periments on J a magnet 



l-VH 



IL ( G TED 





: 



J. I 



^ XI t of R Meteorol ral Jc rna!, kept at Maru 



< S. P. HlLDRETH, .])., - . . . 



XXIV. On a new Protractor for Trisecting A i ; 



A si; Esq., - ... 



XXV. Notes on Upi r„ 



XXVI. me remarks on tr N.jviciil. ncerii, and on a 1 



c tin 



ram ■ bv J a ]). P 



e difficult i jcct; by J. W. B :, 



157 



167 



171 



175 



178 



187 



202 



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(F&rrem<, id er of Contents 9 Si th c 



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II ii ii 





