_ KZ7K7 - s 



BAIRD &TATLOCK. (LONDON) LTD. 



COLLECTIONS. 



Sodium 



,', drwn to the fact that Merck's Collections are supplied in two fonns : (i) in elegant leather 

 (2) in a sunplcr and cheaper style. The latter has been ,nade up u,itk a vicv to f^^ 

 the purchase of these collections by Schools and Colleges. 



VIII. 



Collection of Drugs. 

 278 Bottles with Celluloid Covers. 

 112 bottles 25 cm. high 6.5 cm. diameter 

 75 ,. 18 6 

 91 12 ,, ,, 4 



I. 



Potassium and Sodium Metal. 



CASE CONTAINING : 

 metal crystallized i in ]arge oc tahedra. 



Each specimen is sealed in a glass tube. 

 Potassium-sodium alloy composed of i part potassium and 



i part sodium forming a fluid closely simulating mercury, 



melting point 8C. 

 HHSC three substances are hermetically enclosed in an 



atmosphere of hydrogen. 

 The price of the case depends on the size, regularity and 



beauty of the crystals (i tube Potassium i6/- to 19/6, 



I tube Sodium n/- to 13/6, i tube alloy I3/- to 19/6). 



II. 



Metals. 



Set of 56 specimens in case, 76/6. 

 Set of 56 specimens in elegant leather case, io2/-. 



III. 



Collection of 18 Preparations for spectroscopic investigations 



in glass vessels fitted with platinum wires. 

 Viz. : Ba Cl, + 2 H 2 O ; Cu C1 2 + 2 H 2 O ; Cs Cl ; 



Ca Cl, + 6 H.O ; K Cl ; In, Cl, ; Li Cl ; Na Cl, 



PbCl 2 ; Rb Cl; Sr C1 2 + 6 H 2 O ; Tl Cl ; Se ; 



Zn C1 2 ; Te C1 4 and 



Di (N0 3 ) 3 ) 



K Mn O 4 m solutions. 



Er (N0 8 ) 3 j 



51; case included. 



71 / elegant leather case included. 



IV. 

 Collection of the 64 most important elements in glass tubes : 



(a) small size 657- case free. 



,, loo/- elegant leather case free. 

 (6) large size IO2/- case free. 



1417- elegant leather case free. 



V. 

 Collection of Alkaloids: 



in glass tubes of i gramme fluid measure. 

 (.;) 52 alkaloids ioz/- per set, box free. 



I28/- ,, ,, in elegant leather case. 



(b) 72 ., i8o/- ,, ,, box free. 



2io/- ,, ,, in elegant leather case. 



VI. 



Collection of Glucosides, and other non-basic vegetable 

 substances. 



52 preparations, 38/6 per set, box free. 

 ,, 62/- ,, ,, in elegant leather case. 



35/- 



IX. 



Collections of 



VII. 



Preparations Illustrative 

 Chemistry. 



of Physiological 



587- 

 M/- 



Collections of Imitation and Models of Gems. 



No. i. 21 models of the most celebrated diamonds 



No! 2. 4 - 



No. 3. 24 imitations of gems 



No. 4. 40 ,, ...... 2 4/' 



Each collection is supplied in a suitable case. 



X. 



Collection of Artificial Crystals. 



Arranged according to Professor P. GROTH'S Comparative 

 Table of 32 Classifications of Crystals. 



Collection I. 



Set I. Size of crystals about 15 mm. .. us/- 



Set II. ... 25 to 33 mm. 



Collection II. 

 Set I ....... 



Set II ..... 



Collection III. 

 Set I ......... 



Set II ..... 



For the display of these crystals we recommend holders fixed 

 in a wooden foot and covered with a glass shade which we can 



supply as follows : 



Small med. large. 



Holders 5d. 6d. ?d. per holder. 



Glass shades yd. '9<1. id- shade. 



XI. 



Collections of Models of Crystals 



made of wood. 

 Price according to the size, form and number of the models. 



XII. 

 Glass Cubes. 



I. Cubes of uranium glass, 2/- each. 

 II. Parallelopipeda of didymium and erbium glass, each 



about 3 grammes p. cube 1/4. 

 III. Cube of saphirine glass, producing a coffee-coloured 



and azure-blue fluorescence : 

 Small cubes about 8 mm. each 1/4 



Larger cubes about 10-12 mm. each . . 



XIII. 



Single Meteorites. 



Polished, one half being etched with Widmannst. figures 

 price according to size. 



98% crystallized 



42 preparations, 467- per set, in box. 

 ,, ,, 677- in elegant leather case. 



XIV. 



Bismuth Metallic. 



XV. 



. . Ib. 



Collection of 203 Varieties of Russian Minerals 



83/- 



14 - CROSS STREET HATTCTK GARDETST, E- C 



1244 



