Tue MICROSCOPE. 177 
Moore we learn that he still continues to see what can be seen 
with his high-angled glasses. He has just resolved Nos. 16 and 
17 of Méller’s mono-brom. plate with his one-sixth objective, 
using central light, resolving No. 16 into dots. He facetiously 
adds “ beat that with your one-fiftieth if you can.” He further 
-adds “and the one-sixth will show a tube cast better than any 
one-fiftieth ever made.” All of this we most seriously do not 
doubt. <A one-fiftieth is not made to study tube-casts, which a 
_ good four-tenths will show; neither is it made to resolve dia- 
toms. Such a glass cannot be made to advantage with much 
greater numerical aperture than 1.17. How can such a glass 
compare with a one-sixth with the aperture raised to 1.35? So 
Dr. Moore may take along this line in perfect accord with us; 
but how will it be when it comes to study the nuclear changes 
in the very lowest and smallest forms of life? What service 
would the one-sixth have rendered Dr. Dallinger in working out 
the wonderful phenomena, so graphically described by him in 
his presidential address? Who could accurately measure, with 
his filar eye-piece micrometer, such small bodies as blood cor- 
puscles, with no higher objective than a one-sixth? The whole 
matter, it appears to us, is best expressed by saying, “there is a 
place for everything, and everything should be in its proper 
place.” There is a place for a one-sixth of 1.35 and Dr. A. Y. 
Moore has just the proper place for it; there is a place for a 
one-fiftieth and we are glad we have it. 
New Mertuops anp New Marine Boxes.—Mr. J. D. Beck, 
of Liberty, Pa., sends us a box containing half a dozen slides. 
The slides show the result of his new method of double-stain- 
ing. This method consists in employing such means, whereby 
it is possible, after staining, to dehydrate the sections in abso- 
lute alcohol without having the color’in the least removed by 
the alcohol. Mr. Beck “ does not feel able to give the process 
to the public but will sell the same to private parties, including 
one slide, for seventy-five cents.” We are not willing to express 
an opinion on the subject while thus in the dark, but will add 
that the slides are good illustrations of double-staining of vege- 
table sections. The box is also an invention of Mr. Beck. This 
consists of a block of wood the length of a glass slide and of 
any width desired. Grooues are sawed lengthwise nearly 
