1042 General Notes. [Nov 
4. Mayers Carmine.—This staining-fluid, previously described 
as “ Alcohol Carmine,”* is a modification of Grenacher’s acid 
carmine, 
Carmine 4 gm. $ 
Water. 15 ccm. 4 
s Hydrochloric acid 30 drops. ; 
Alcohol (85 %) 95 ccm. 
Ammonia (enough to neutralize). i 
The pulverized carmine is mixed with the water and the acid, 
. The Latest Camera Lucida of Abbe?—Zeiss makes two — 
forms of the new Abbe camera lucida. Both are constructed 
field can be projected on the drawing-paper only by giving the 
0 
mirror an inclination differing so much from the angle (45) : 
required for accurate drawing that the image is more oF d 
_ the Abbe camera is superior to that of Oberhauser 1 s 
important particulars: it gives a much larger field of ve 
better light. Its construction does not admit of use ies ; 
microscope-tube in a horizontal position. This is a defect w 
ought to be at once corrected. sed to 
The Abbe cameras, especially the larger one, can be gRr : 
great advantage with the embryograph of His. It is on pe 
sary to add to the stand a horizontal arm, to which the : 
can be fastened. in the 
The construction of the Abbe camera is illustrated 1 a 
accompanying cut. | eo eflection 
The Siiwitie surie is made visible by a a of 8 
from a large plane mirror, and from the silvered The micro- 
small prism in the visual point of the eye-piece. , the silvet- 
~ Scopic image is seen directly through an apparatus 1n ed of the 
Ing of the prism. By the concentricity thus pepan a 
_ bundle of rays reaching the eye from both the "a without 
ne paper, the image and pencil are seen edina a4 
_ any straining of the eyes. With this apparatus, moreov’™ 
* Whitman, Methods of Research, etc., pe 39- 
k Pissa Catalogue, 1885, P- 44, No.70. 
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