NOTE. 



Since this paper was in print, a friend has placed in my hands a slip cut 

 from a St. Louis paper, containing a note from Prof. G. C. Swallow, State 

 Geologist of Missouri, dated Geological Rooms, Columbia, Mo., February 18, 

 1858, addressed to the President of the St. Louis Academy of Sciences, an- 

 nouncing the fact that Major F. Hawn had placed in his hands a collection 

 of fossils from Kansas, which he (Prof. S.) had determined, beyond a doubt, 

 to be of Permian age. Under the circumstances, it is I think, incumbent 

 upon me to give a brief statement here as to how the fossils described in the 

 foregoing paper came into my hands, and what authority I had for publishing 

 the same. 



As long back as December, 1856, Major Hawn wrote me he was making 

 geological investigations in Kansas, and then, as well as at various times 

 afterwards, stated he had made a collection of fossile which he intended to 

 send to me. Some time elapsed before the fossils came to hand ; as soon as 

 they arrived, however, I was strongly impressed with the idea that a por- 

 tion of them belonged to the Permian system. (Major H. spoke of them all 

 in his letters as Cretaceous and Carboniferous.) Not knowing his inten- 

 tions, I wrote back to him what I thought about the fossils, and then, or in one 

 of my letters, asked the privilege to bring out some of his results, and to de- 

 scribe his new species, giving him credit for the discovery of the same. 

 Subsequently, I received from him the following reply, dated Weston, May 

 24th, 1857 : 



" Dear Sir — Your letter of the 10th inst. was received yesterday, asking 

 privilege to use the information I have furnished you. * * * You will 

 readily see I can accomplish much through your publication of the informa- 

 tion I furnish you, under the circumstances you mention [that was that I 

 should give him the credit above alluded to], though I should travel over the 

 same ground in a future publication of mine. My publication will be written 

 with a view to popular reading, rather than scientific effort. * * * You 

 then have my entire consent to use any information in your possession 

 through me, as you may think best." 



