374 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Elements of Applied Microscopy.* — The author, C. E. A. Wilson, 

 in an apologetic introduction, remarks that this little work which is 

 intended for the teacher and the beginner with the Microscope, contains 

 very few original data, and treats no single subject with completeness. 

 In less than 170 pages, divided into twelve chapters, the author flits 

 over the following fields, functions and parts of the Microscope : — Its 

 manipulation ; mounting and preparation ; micrometry ; common 

 starches ; foods and drugs ; textile fibres ; paper ; the Microscope in 

 medicine and forensic medicine ; microchemistry ; petrography and 

 metallography. To those who desire a superficial glance at the possibi- 

 lities of the Microscope and its practical application, this elementary 

 treatise may be of service. 



Optical Dictionary.! — This new glossary of terms chiefly relating to 

 optics and optical instruments is mainly intended for the use of students 

 and members of the optical industry. It will, however, be found helpful 

 to a wider circle, as it deals with terms used in ophthalmology, photo- 

 graphy, mathematics, and closely allied sciences. The volume is edited 

 by C. Hyatt- Woolf. 



Microscopist's Screen.} — J. Peiser describes a screen for protecting 

 the eyes of microscopists against the light. The framework clips on to 

 the ocular and to the ring is attached a T-shaped piece of wire to which 

 is fixed a piece of black satin. 



B. Technique. § 

 (1) .Collecting 1 Objects, including- Culture Processes. 



Flagella of Bacillus Typhosus. — W. J. Dibdin exhibited photo- 

 graphs of the Bacillus typhosus at the April meeting, showing the 

 flagella in a more marked manner than usual. It was found as the 

 result of a considerable number of cultures of this organism, that the 

 flagella are most highly developed in cultures which are between 12 and 

 20 hours old. In the photograph the considerable extensions of the 

 flagella are shown. 



The method of preparation was as follows : — The culture used was a 

 lG-hour-old agar streak sub-culture from a gelatin streak culture. 

 Some of the growth, as much as was obtained by touching the culture 

 with a sterile wire, was smeared on a watch-glass and 1 c.cm. of sterile tap- 

 water added. Without mixing in any way, the watch-glass and contents 

 were then incubated at 40° C. for 30 minutes. Drops of the water, 

 throughout which the more active of the flagellated bacilli had spread, 

 were taken from the edges and spotted on cover-glasses. These cover- 



• New York, John Wiley and Sons; London, Chapman and Hall (1905) xii. and 

 108 pp., CO figs. 



t London, Gutenberg Press, Limited (1905) 77 pp. 



X Zeitschr. wiss. Mikrosk., xxi. (1904) pp. 467-9 (2 figs.). 



§ This subdivision contains (1) Collecting Objects, including Culture Pro- 

 cesses ; (2) Preparing Objects ; (3) Cutting, including Imbedding and Microtomes ; 

 (4) Staining and Injecting ; (5) Mounting, including slides, preservative fluids, &c. ; 

 (6) Miscellaneous. 



