330 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Whitney's Life-Box.* — J. E. Whitney reduces the eost of a life- 

 box to a niinimum by getting a full set of brass ferules, consisting of 

 about a dozen of graduated sizes, fitting one inside the other. Take 

 any two which fit well together and cement the smaller one, large 

 end down, to the centre of an ordinary glass slide. Cement to the 

 top of the ferule one of the thickest cover-glasses that fits it. Take 

 another thick cover-glass which fits inside the large ferule, and 

 cement it to the inside at the top. The box is now complete, and all 

 that remains to be done is to slip the large ferule over the other. 

 Mica can be used instead of the cover-glasses if desired. The set 

 will make an assortment of various sized boxes. 



Micrometers mounted in Media of High Refractive Index. — 



It was suggested some years ago | that a Nobert test-plate should be 

 mounted in a saturated solution of phosphorus in bisulphide of 

 carbon, with the view of incieasiug the visibility of the lines. 

 Prof. W. A. Rogers has ajiplied the same method to a stage- 

 micrometer made for the National Museum at Washington. Whils 

 not better in ruling than others from the same source, it is reported 

 to be of peculiar excellence, owing to the fact that it is mounted in 

 Prof. Hamilton Smith's medium. The fine lines are thereby made 

 far more visible and sharp than on ordinary micrometers, and, as 

 anticij^ated in the case of Nobert's plate, " very fine lines, which are 

 scarcely visible otherwise, are readily seen when mounted in the new 

 medium." 



Atwood's Apparatus for Photo-micrography. § — H. F. Atwood 

 describes an " apparatus capable of doing any work in photo-micro- 

 graphy perfectly, and that can be put in the hands of the microscopist 



Fig. 82. 



at an expense less than that of ordinary camera attachment for his 

 Microscope." It is shown in fig. 82. 



The coarse adjustment is made by sliding the stage and fittings 



* Proc. Amer. Son. Micr., 7th Ann. Meeting, 1884, p. 215. 



t In a paper by Mr. J. W. Stephenson. See this Journal, ii. (1882) p. 164. 



X Amer. Mon. Micr. Journ., v. (1885) p. 38. 



§ Proc. Amer. Soc. Micr., 7th Ann. Meeting, 1884, pp. 176-7 (1 fig.). 



