32 



REPORT ON EXCHANGES. 



Subject. 



Insects - 



Instruments of precision 



International law 



Invertebrate palneontology 



Librarian's art and bibliography 

 Literature, ancient and classical 



Lithology 



Logic 



Machine construction 



ManiHials 



Marine invertebrates 



Mathematics 



Mathematics and algebra 



Mechanical engineering 



Mechanics and machineiy 



Medicine and surgery 



Metallurgy 



Marine engineering 



Metaphysics and psychology . . . 



Microscopy 



Military engineering 



Military sciences 



Mineralogy 



Mineralogy, chemistry, and 



physics 



Mining. 



Mining and metallurgy 



Music 



Naval architecture 



Naval arts 



Naval engineering 



Naval machinery 



Refer- 

 ences. 



86 



2 



6 



119 



150 



7-2 



68 



7 



1() 



58 



50 



16 



27 



18 



24 

 10 

 13 

 19 

 17 

 36 

 50 



39 



101 



3 



8 



28 



113 



12 



11 



Subject. 



Numismatics 



Ordnance 



Paper and printing 



Patents 



Ped agogv 



Philology 



Photography 



Physics 



Political economy 



Political science 



Prime motors 



Psychology 



Railroad -. 



Reptiles 



Sanitary engineering . 



Social science 



Sport 



Statistics 



Telegraphy 



Textile and dyeing 



Theology 



Trade 



Wind engines 



Johns Hopkins University ex- 

 change list 



Patent Oftice Library, west 

 I'oom, list of books 



Less duplication of titles 



Total , 



Refer- 

 ences. 



13 

 15 



4 

 11 

 33 

 IG 

 13 

 14 



3 

 41 



7 

 28 



7 

 10 



8 

 24 



5 

 80 



1 



3 



170 



17 



4 



805 

 700 



5, 756 

 26 



5,730 



As sliown by the geographical arrangement, 3,594 distinct titles, rep- 

 resenting 5,730 references, were reported by the collaborators, and it was 

 part of my instructions to ascertain how many of these were already 

 correspondents of the Institution. 



Subtracting from the number of titles the 400 approximated from the 

 unclassified list of books in the west room of the Patent Office Library, 

 and the 866 published in the United States, 2,328 foreign serials remain, 

 and of these 792, or 34 per cent,, occur in our list of foreign correspond- 

 ents, which number, howev'er, will be increased to some extent by the 

 correction of titles, given in many cases but very indistinctly, and by 

 the assignment to the proper society on the list of correspondents of 

 magazines and journals properly to be designated under the name of 

 the society; and it is believed that upon that correction nearly one-half 

 of all the foreign titles given may be considered as correspondents of 

 the Institution. 



I beg here to state that owing to the press of routine duties all the 

 work connected with, the library inquiry has been performed by me in 

 my leisure hours. 



Worlc performed. — During the past year 61,940 packages, represent- 

 ing a weight of 141,263 pounds, were received. Of these 10,294 were 



