54 



SCIENCE. 



Table. 



No. 



IxCaUlUg \Ji 



Poloriscope. 



Percentage of 

 Reducing Matter 

 by Copper 

 Solution. 



Percentage of 

 Reducing Matter 

 by Polariscope. 



+ Differences. 





52.65 



53 



20 



53 



44 



•23 



2 



46.07 



61 



73 



61 



66 



3 



52.65 



52 



36 



53 



43 





4 



43-05 



62 



50 



64 



90 



2.40 



5 



48.04 



59 



35 



58 



75 







6 



47.70 



61 



40 



59 



63 



.... 



7 



49.80 



58 



8d 



57 



00 





8 



48.45 



58 



55 



58 



56 



.01 



9 



50.26 



55 



60 



56 



45 



.85 





51.50 



53 



5o 



54 



88 



I.30 



n 



50-57 



56 



49 



56 



04 





51-74 



56 



18 



54 



58 





13 



40.83 



69 



93 



68 



21 





14 



40.00 



69 



30 



69 



25 





15 



50.53 



56 



34 



56 



09 





16 



63.80 



39 



22 



39 



SO 



.28 



17. 



51-73 



54 



05 



54 



37 



■32 



-Diffe ences. 



•07 

 I.07 



.60 

 1.77 

 I.80 



•45 

 1.60 

 1.72 

 .05 

 .27 



NEW PORTABLE MICROSCOPE. 



We present with this number two illustrations show- 

 ing a new form of portable microscope stand, designed 

 by Mr. E. H. Griffith, and called by him the " Griffith 

 Club Microscope," the chief merit of which appears to be 



clear understanding of what Mr. Griffith has produced. 

 It will be seen that much originality has been displayed, 

 and that novelty of construction is a leading feature. 

 The greatest innovation is the use of an ordinary self- 

 centering turn-table for mounting, as a stand for the in- 

 strument ; if, however, the turn-table is required for use, 



Griffith's Portable Microscope. (Fig. 1.) 



its portability, and adaptability to certain positions, which 

 are impossible with the ordinary instruments. 



To those familiar with the use of the microscope an 

 examination of the illustrations will suffice to arrive at a 



the microscope can be closed and used as a stand for the 

 turn-table. The fine adjustment is also an original de- 

 vice of Mr. Griffith, and will be noticed as a large milled- 

 edged screw in the cut. On the inner surface of this cir- 



