Heather, J. F. Optical Instruments, including more especially 

 Telescopes, Microscopes and Apparatus for Producing Copies of 

 Maps and Plans by Photography. 1 vol., 12mo. London, 1871. 



75 cents. 



How to Choose a Microscope. By a Demonstrator. 

 London. 8 vo., paper. 50 cents. 



King, John. The Microscopist's Companion: A Popular Manual 

 ot Practical Microscopy. Designed for those engaged in micro- 

 scopic investigation, schools, seminaries, colleges, etc., and com- 

 prising selections from the best writers on the microscope rela- 

 tive to its use, mode of management, preservation of objects, 

 etc. To which is added a Glossary of the principal terms used 

 in microscopic science. With 114 illustrations. 1 vol., 8vo. $2. 



Martin, John H. Manual of Microscopic Mounting, with 

 Notes on the Collection and Examination of Objects. 1 vol., 

 8vo. London, 1872. $3. 



McDonald. J. D. A Guide to the Microscopical Examination 

 of Drinking Water. With 24 plates. 1 vol., 8vo. $3. 



Micro graphic Dictionary. Third edition. Greatly en- 

 larged. 1 thick vol. Cloth. " $21. 



Nageli und Schwendener. Das Mikroskop. Theorie 

 und Anwendung Desselhen. Leipzig, 1877. $5.50. 



Nave, Johann. Handy Book to the Collection and Prepar- 

 ation of Fresh-Water and Marine Algae, Diatoms, Desmids, 

 Fungi, Lichens, Mosses, and other of the Lower Cryptogamia. 

 Translated by Kev. W. W. Spicer, A. M. London, 1869. 1 vol., 

 16mo. $1.25. 



Parkinson, S. A Treatise on Optics. 1 vol., 12mo. $3.50. 

 This is the standard English text-book on Optics. 



Pelletan, Dr. J. Le Microscope. Son Emploi et ses Applica- 

 tions. Four plates and 278 wood engravings. Paris, 1876. 1 

 vol., 8vo. Paper. $5.50. 



Rutherford, William. Outlines of Practical Histology. 1 

 vol., 12mo. $2. 



Sachs, Julius. Text-Book of Botany, Morphological and 

 Physiological. Translated by Bennet & Dyer. One large vol- 

 ume, royal 8vo. London, 1875. $12.50. 



Schafer, Edward Albert. A Course of Practical Histology. 

 Being an Introduction to the Use of the Microscope. Phila- 

 delphia, 1877. $2. 



Spottiswoode, William. The Polarization of Light. Lon- 

 don, 1874. 1 vol., 12mo. $1.50. 



Wythe, J. H. The Microscopist: A Manual of Microscopy and 

 Compendium of the Microscopic Sciences, Micro-Mineralogy. 

 Micro-Chemistry, Biology, Histology and Pathological Histologv, 

 Third edition. Rewritten and Greatly Enlarged. 205 illustra- 

 tions. Philadelphia, 1877- $4.50. 



