MISCELLANEOUS. 1055 



4414. Dyeing and Cotton Printing. 



4415. Collection of Products, III. Course. 



4416. Iron, its production, manufacture, and use. 



4417. Collection of Caterpillars, with text, by Director 

 Dr. Bolan. 



4418. Cabinet containing Silkworms. 



4419. Forest Herbarium, Parts I. and II. 



4420. Herbarium of Poisonous Plants. 



4421. Herbarium of Grasses. 



Ckr. Vetter, formerly Ludw. ffestermann, Hamburg. 



Apparatus and Instruments for Chemists and Natural 

 Philosophers. 



4423. Chemical Scale for 1 ko. weight, indicating 1 milligr., 

 with special balance and scales, and stopping arrangement ; gilt ; 

 the scales are of platinum, in glass case ; the beam works on agate 

 planes. 



4424. Set of Weights belonging to the same, gilt, from 1 ko. 

 downwards. 



4425. Two Sets of Weights, from 50*0 grin, downwards, 

 nickel plated. 



4426. Sets of Weights of Bock Crystal, from 200*0 

 gr. downwards. 



The weights of 200-100 grammes have a cylindrical form. This form has 

 been chiefly chosen in order that, in case of any neglect, injuries might be 

 avoided as much as possible. 



4427. Normal SOO'O gr. Weight, of rock crystal. 



W. J. Rohrbeck, J. F. Luhme $ Co., Berlin (Dr. Herm. 

 Rohrbeck). 



Physics. 



4428. Single-barelled Air Pump, with standing glass 

 tube, double acting, on wooden stands. 



The arrangement of the air pump is such that the position of the stop-cock 

 of the receiver places it alternately in connexion with the upper and the lower 

 part of the cylinder. 



The pump is particularly adapted for exhausting a large number of reci- 

 pients, as is very frequently requisite at scientific experiments in labora- 

 toyes. 



