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Previous Issue: Vol. 18, No. 441, Jul. 17, 1891
Next Issue: Vol. 18, No. 443, Jul. 31, 1891
Museums and Their Purposes, pp. 43-46
Notes and News, pp. 46-47
[Editorial Notes], p. 48
Investigations upon Nitrification and the Nitrifying Organism, pp. 48-52
The Parasite of Quartan Ague, pp. 52-53
Letters to the Editor
- On Some Extinct Vertebrata from the Miocene Rocks of the North-West Territories of Canada Recently Described by Professor Cope, p. 53
- Henry M. Ami
- Osteological Notes, pp. 53-55
- D. D. Slade
Among the Publishers, p. 55
Back Matter (3 pp.)
Previous Issue: Vol. 18, No. 441, Jul. 17, 1891
Next Issue: Vol. 18, No. 443, Jul. 31, 1891