1891.] Presents. 117 



The foregoing tables suggest the following remark : " The volumes 

 of air expired for 1 gram CO 2 immediately after re-breathing air vary 

 but slightly from the corresponding volumes of air emitted in 

 ordinary breathing ; in every case except one, the volumes of air are 

 & little higher immediately after re-breathing." 



Presents, January 15, 1891. 

 Transactions. 



Birmingham: Mason Science College. Calendar, 1890-91. 8vo. 

 Birmingham 1890. The College. 



Bordeaux : Societe de Medecine et de Chirurgie. Memoires et 

 Bulletins. 1889. Fasc. 3-4. 8vo. Bordeaux 1890. 



The Society. 



Boston : American Academy of Arts and Sciences. Proceedings. 

 New Series. Vol. XVI. 8vo. Boston 1889. The Academy. 



Breslau: Schlesische Gesellschaft fur Vaterlandische Cultur. 

 Jahresbericht. 1889. 8vo. Breslau 1890. The Society. 



Brighton : Brighton and Sussex Natural History and Philosophi- 

 cal Society. Abstracts of Papers read, together with Annual 

 Report, 1888-90. 8vo. Brighton. The Society. 



Brooklyn: Brooklyn Library. Thirty-second Annual Report. 

 8vo. Brooklyn 1890. The Library. 



Brussels : Societe Royale Malacologique de Belgique. Annales. 

 Tome XXIV. 8vo. Bruxelles 1889 ; Proces-Verbaux. Tome 

 XVIII. Tome XIX. Janvier Aout. 8vo. Bruxelles 1889-90. 



The Society. 



Buitenzorg : 'S Lands Plantentuin. Mededeelingen. Stuk 7. 

 8vo. Batavia 1890 ; Verslag. 1889. 8vo. Batavia 1890. 



The Director. 



Cambridge, Mass. : Harvard College. Museum of Comparative 

 Zoology. Bulletin. Vol. XX. No. 3. 8vo. Cambridge 

 1890. The College. 



Harvard Univei-sity. Bulletin. Vol. VI. No. 3. 8vo. [Cam- 

 bridge] 1890. The University. 



Catania : Accademia Gioenia di Scienze Naturali. Bullettino 

 Mensile. Fasc. 13-14. 8vo. Catania 1890. The Academy. 



Copenhagen : Academic Royale. Memoires (Classe des Sciences). 

 Vol. VII. Nos. 1-3. 4to. Copenhague 1890. 



The Academy. 



Cracow : Academie des Sciences. Bulletin International. 

 Comptes Rendus des Seances. Octobre Novembre, 1890. 

 8vo. Cracovie. The Academy. 



Danzig : Naturforschende Gesellschaft. Schriften. Bd. VII. 

 Heft 3. 8vo. Danzig 1890. The Society. 



