ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



113 



to the arm I, and the object observed while the chamber in which it 

 is placed is being exhausted.* 



Improved Griffith Club Microscope.f — The original " Griffith 

 Club Microscope " was described in Vol. I. (1881) p. 293. Since that 

 time important changes have been made by Mr. E. H. Griffith, so that 

 very little of the original form is left, as will be seen on comparing 

 figs. 8 and 9 with the earlier illustrations. It retains its original 



Fig. 8. 



name in appreciation of the honour conferred on the inventor by the 

 « Griffith" Clubs of Detroit and Danville, U.S.A. It is a full-sized 



* Since the above was in type we observe that a nearly identical instrument 

 is described by Dr. L. Dippel (in 'Das Mikroskop,' 2nd ed. 1882, p. 685, fig. 496) 

 as made by Zeiss. 



t Proc. Amer. Soc. Micr., 5th Annual Meeting, 1882, pp. 149-52 (3 figs.). 

 Ser. 2.— Vol. Ill- I 



