540 



SCIENCE. 



[Vol. I., No. 19. 



be made, there are clocks controlled, ac- 

 cording to Jones's method, hj a standard 

 clock provided with Professor Young's 

 gravity escapement. The room in which 

 this beautiful instrument stands is, like' 

 the constant temperature room in the 

 basement of the tower, provided with 

 double walls to prevent fluctuations of 

 temperature. Among the instruments of 

 precision included in the equipment of the 

 laboratorjr, ma}' be mentioned two cathe- 

 tometers, a standard metre and 3'ard bj- 

 Professor Rogers of Cambridge, one com- 

 parator, two fine chronographs, three sphe- 



nations involving measurements of the 

 greatest accuracy'. 



On the second floor are the mineralogi- 

 cal laboratorj-, furnished with blowpipe 

 tables covered with white Minton tiles, 

 the large chemical lecture-room, the mu- 

 seum for the collections of mineralogy 

 and industrial chemistrj', storerooms, and 

 private laboratories. The third floor con- 

 sists of the laboratories for qualitative 

 and quantitative analysis, the photo- 

 graphic laboratory', rooms for special 

 work in organic chemistrj- and gas anal- 

 j-sis, balance-room, reading-room, and 

 storerooms. 



The equipment of the building will be 

 complete in everj- particular ; and no pains 

 have been spared to secure the most per- 

 fect apparatus to be obtained at home or 

 abroad. Manj' important improvements in 

 the fixtures and arrangement of the labora- 

 tories, work-tables, gas and water supplv', 

 have been introduced. 



The two departments have been rap- 

 idly outgrowing their accommodations dur- 

 ing the past few j'ears, and the increased 

 laborator}' space the new building will af- 

 ford will effect a marked increase in the 

 amount of special and original work. 

 Spencer B. Newbury. 



rometers, a spectrometer with twelve-inch 

 circle reading to single seconds, two mag- 

 netometers, several galvanometers of high 

 and low resistance, sets of resistance coils, 

 and different forms of calorimetric apjjara- 

 tus. 



Students entering the laborator}' begin 

 with simple illustrative experiments, and, 

 as they acquire skill in manipulation, are 

 assigned experiments requiring the use of 

 instruments of precision. Some of the 

 more advanced are now making determi- 



