ERRATA, AND ALTERATIONS FROM MS. — VOL, XIX. NO. 1. 



Art. V. page 46, for C whenever it occurs, read c'. 



" 49, 5th line from top, for 1, read — 1. 

 Page 49, 3d line from bottom, instead of " If the impulses act continually," sub- 

 stitute If the impulses are indefinitely small and act continually. 

 Art. IX, page 61, first line, after have read not. 



vol. XVIII. no. 2. 



Page 363, 10th line from bottom, before scientific read un. 

 372,8th line from bottom, dele M. D. 

 373, 3d line from top, for appears read appeared. 

 " 11th " " *• for or read on. 



cc 



14th 



.. 



cc 



c< 



JYo 



375, for geodiferous read cornitifcrous. 







TO CONTRIBUTORS, 



In order to avoid embarrassing mistakes, the Editor requests all those 

 authors of communications, to whom payment would be agreeable, to 

 put, in all cases, the letter P at the head of their pieces ; unless this 

 is done or notice given to the Editor in some other way, he will con- 

 clude that their contributions are gratuitous. 



