378 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



squares of note paper, letting the writing run the long way of the slide. 

 Card shoes require no labels, and can be stacked one on the other. 

 Suitable cells may be cut of any depth from compo gas piping, and 

 fastened with marine glue. 



Beck's Safety Cedar Wood Oil-Bottle. — In shape this bottle (fig. 

 62) resembles a cone. The metal cap is fitted with a flexible wire looped 



at the end for holding a drop of the oil. The 

 central tube is ground into the main bottle to 

 form a good joint. The bottle is filled by re- 

 moving the tube. 



New Method for neutralising Carmin 

 Injection-Masses.* — P. Konaschko states that 

 he is able to get good injection masses by the 

 following method. Ammonia carmin is added 

 to gelatin solution in the ordinary way. The 

 neutral reaction is determined, as usual, by the 

 disappearance of the odour of ammonia, and 

 then any trace of ammonia is detected by means 

 of dialysing the mass through animal membrane. 

 If the carmin mass will not diffuse through 

 such a membrane, it will not permeate blood 

 vessels. The membrane used is the septum cisternse of the Frog. The 

 membrane is taken up with a forceps, the blades of which are flat and 

 perforated. On one side of the membrane is placed a drop of the 

 warm mass, on the other side a piece of writing paper moistened with 

 physiological salt solution. If the mass is sufficiently neutralised the 

 paper remains unstained after one to two minutes. As it is possible to 

 oversaturate the mass with acetic acid, which would precipitate the 

 carmin, it is advisable after each addition of acid to examine the injection- 

 mass under the Microscope. 



Fig. 62. 



Metallography, etc. 



Microscopic Analysis of Metals.f — The metallographic work of 

 Floris Osmond is so well known and so universally appreciated, that the 

 appearance of a text-book by him on the microscopic analysis of metals 

 will be welcomed by all who are interested in this aspect of the subject. 

 The volume is edited, and presumably englished, by J. E. Stead, a fact 

 which affords an additional recommendation. The style is most lucid, 

 and the illustrations copious and excellent. 



In the first part metallography is considered as a method of assay. 

 Under this heading the author deals with the subject in three sub- 

 divisions : the anatomical, or the identification of individual constituents ; 

 the biological, or the transformations which occur in the life of metals 

 and alloys under the influence of heat and pressure ; the pathological, or 



* Zeitschr. wiss. Mikrosk., xx. (1904) pp. 280-1. 



t London, Charles Griffin & Co., Ltd., 1904, x. and 178 pp., with diagrams and 

 90 photographic illustrations. 



