326 THE AMERICAN MONTHLY [Nov 



to this point, by turning the table at a moderate speed 

 and by raising the brush slightly towards the finish. Old 

 gold-size is best, provided it will run easily, The second 

 ring should be added after the first is thoroughly dry. 

 Finally, a ring or two of Brunswick black or white zinc 

 cement may be run over all as a neat finish. We have 

 seen suggestions for various colored cements to be used 

 for various classes of objects, botanical, zoological, min- 

 eral, etc.; but if a distinction is to be made, we think it 

 should refer rather to the mounting medium employed. 

 Our own practice, for instance, is to ring all opaque and 

 dry mounts with Brunswick black, Canada balsam mounts 

 with white zinc cement, glycerine mounts with white zinc 

 cement with a fine black ring in the centre, and other 

 mounts with a white ring on a black one. For use with 

 immersion lenses, all mounts must be carefully ringed 

 with shellac cement, or HoUis' liquid glue, or the cedar 

 oil will dissolve the cement. 



MICROSCOPKAL NOTES. 



A Manual of Clinical Diagnosis by means of Micro- 

 scopic and Chemical Methods, for Students, Hospital phy- 

 sicians, and Practitioners. By Charles E. Simon, M. D. 

 Third Edition, thoroug-hly Revised. 8vo., pp. 558. Illus- 

 trated with 136 Engravings and 18 plates in Colors. Phil- 

 adelphia & N. Y : r^ea Bros. & Co. 1900. Price, $3.50. 



It would be a rather difficult matter to take into consid- 

 eration the various features of such a complete manual. 

 Suffice it to say that it is both systematic and complete. 

 Much new matter has been added, more especial attention 

 having been paid to the recent developments in blood di- 

 agnosis. Hemology has received full consideration, and 

 most deservedly so in view of the important factor it has 

 become in the matter of the exact diagnosis of disease. 

 The work is a most valuable and helpful one, and no phy- 

 sician can afford to do without it and the valuable help it 

 will render him. 



