90 



SUMMARY OF CURRENT RESEARCHES RELATING TO, 



Barbour's Pocket Microscope.* — This is also primarily intended for 

 field geologists, and is small enough to be carried in the vest pocket, the 

 entire size being scarcely larger than an objective-case. A, fig. 9, shows- 

 the instrument open ; B, shut. C is a lens-case for comparison as to 

 size. The following magnifications are obtained, viz. 100, 60, 40, 30, 20,. 

 and 15 diameters, which are amply sufficient for field work. 



Fig. 9. 



Regaud, Cl., et Nachet, A. — TJne nouvelle monture de microscope muuie 

 d'une platine mobile reperable a mouvements tres etendus. 



Arch. d'Anat. Microsa, V., fasc. 1 (1902) p. 17. 

 Regaud, Cl. — Nouveau microscope pour l'etude des coupes en series. 



Comptes Rend. Assoc, des Anatomistes, '6, Lyon, 1901, p. 262. 



* Journ. App. Micr., v. (1902) pp. 1963-5 (1 rig). 



