186 BOARD OF REGENTS. 



to a reciprocal correspondence all the principal learned bodies, whether national or 

 foreign, whose studies or investigations are analogous to those of this institute. 



As this academjr is the most modern it is proper that it should propose the com- 

 merce of the ideas and theories necessary to the progress of moral and political 

 science. And it does not hesitate an instant in sending to your institution the account 

 of its own commencement and organization, as well as the publications that have 

 marked its short life. 



The credit which your institution has acquired for taking so much interest in all 

 that favors the advancement of civilization and improvement of the people, inspires 

 the academy of Madrid with confidence that its wishes will be accomplished, and that 

 the illustrious body to which it directs itself to-day will honor it with its correspond- 

 ence, and accept the exchange of memorials or other works which have been or will 

 be published in future. 



MANUEL GARCIA, 



Acting President. 

 By order of the Academy. 



PEDRO GOMEZ DE LA SERRA, 



Secretary. 

 The Smithsonian Institution. 



Mexican Society of Geography and Statistics, 



Mexico, February 13, 1862. 

 Dear Sir : After some delay this society has received your letter and the accom- 

 panying books. 



The society desires me to return sincere thanks, and to say that it fully appreciates 

 the generous offer that you make in the name of your institution. 



Our society accepts your propositions. It will soon send, in the manner that you 

 suggest, some of its literary and scientific productions, and also those of the other 

 learned bodies whose works you ask for. It will also take care to put in the hands of 

 the agent you refer to, all the periodical publications as they appear. 

 "With the highest consideration, &c, I remain, 



D. V. GUADALOUPE. 



The Secretary of the Smithsonian Institution. 



Koenigsberg, November 23, 1861. 



Sir : I have the honor to apprise you of my return from England, and the result 

 of my labors in the interest of the Smithsonian Institution ; but I must first tender 

 my thanks for having been enabled to pursue the study of American Neuroptera, to 

 be found in English collections or described by English entomologists. 



I must say that my harvest was pretty good, for in most cases I was able to remove 

 the doubts left in my preceding work. In the collections of the British Museum, 

 especially, I found the types of species I did not know, and some also in the collection 

 of Mr. Westwood, at Oxford, and Mr. Saunders, in London. I hope that with these 

 new species, received after having sent my manuscript to Washington, I can make a 

 tolerably large supplement. But the extent of this supplement and the comparison 

 of species already described by me will require considerable time. I therefore believe 

 it will be more convenient to have my work published as soon as printed, and to give 

 afterwards the novelties and corrections in a separate supplement, which will proba- 

 bly make a pamphlet of about eight to ten sheets. You may rest assured, sir, that I 

 shall endeavor to perform this labor as soon and as well as possible ; but since I can- 

 not always dispose of my time, I fear, considering the extent of the labor, that it 

 cannot be done before six months. 



I find that the translation, the first eighteen sheets of which I have seen, is of per- 

 fect accuracy. Unfortunately the work itself leaves much to be desired. I must, 

 however, consider it a consolation that for a first attempt I have attained so much, 

 and that my work may serve as assistance to further and more fruitful researches of 

 the entomologists of your country. I would be gratified if my, so imperfect, labor 

 should call forth numerous rectifications and augmentations from American natural- 

 ists. At any rate the interest for the advancement of science will always urge me on 

 to make the synopsis better and better. 



I have the honor to remain your devoted, 



H. HAGEN". 



Prof. Henry, &c, &c. 



