198 The Microscope. 



Elements of Botany (E. S. Bastin), Principles of Pharmacognosy 

 (F. A. Flnckiger and A. Tschirch, translated by F. B. Power), 

 Organic Materia Medica (J. M. Maisch), Companion United States 

 Pharmacopoeia (O. Oldberg and O. A. Wall), Micrographic Diction- 

 ary (J. W. Griffith and A. Henfry), Microscopist (J. H. Wytte), 

 Microscope (J. Hogg), How to Work with the Microscope (L. S. 

 Beale), Food and Food Adulterants (Commissioner of Agriculture), 

 Microscopy for Beginners (A. C. Stokes), One Thousand Objects for 

 the Microscope (M. C. Cooke), Microscopic Fungi (M. C. Cooke), 

 Wonders of Plant Life (S. B. Herrick), Objects for the Microscope 

 (L. L. Clarke), Collector's hand Book (J. Nave), National Dispensa- 

 tory (A. Stille and J. M. Maisch), Examinations of Drugs and Medi- 

 cine (C. H. Peirce), Pharmaceutical Journals, Journal of Microscopy, 

 Vegetable Histology (Penhallow), Text Book of Botany (Bessey), 

 Text Book of Botany (Sachs), The Microscope in Vegetable Histology 

 (Schachet) and numerous other works. 



Some of the experiments and work in vegetable histology and 

 physiology that seem the most suitable for the amateur who desires 

 to entertain and at the same time instruct his friends, is a subject 

 that want of space forces us to defer to another time. 



MOKPHO-BIOLOGICAL CHAEACTERISTICS OF THE GEEM 

 OF THE SOUTHERN CATTLE PLAGUE. 



FEANK K. BILLINGS. 



{Continued.) 



^ I HE reader need not look upon these corrections as contradic- 

 -*- tions between former statements, but rather as the result of 

 more extended and exact and scientific observation. These objects 

 being so exceedingly minute, it takes some time to educate the eye 

 so that one can perceive every phrase of development. There are 

 days when one cannot study them continuously at all. The best way 

 to study hanging-drop cultures, when one desires to spend several 

 hours over them, is to first make some cover-glass specimens of the 

 same material or take any other slides of an object of the same size 

 and form, and observe such for about half an hour, thus preparing 

 the eye to see what you want to see in the living, developing 

 organism. Unless this is done, some very essential points will be 

 surely missed and some preventable eiTors fallen into. With any- 

 thing less than a power of 800 diameters, no one should attempt to 

 study these organisms, and then only when aided by the best of 

 Abbe condensers and oil-immersion lenses. 



