26 



SCIENCE. 



[Vol. V., No. 101. 



as the new laboratory is the result of a great 

 deal of thought, it is believed that a brief 

 description of it would be of interest and value 

 to the readers of Science. 



The laboratory adjoins the biological labo- 

 rator} 7 lately described in these pages. A space 

 of forty feet in width separates the tw r o build- 

 ings, securing ample light for both. The north 



city, and will not be occupied by buildings. 

 Thus from all four directions the laboratory is 

 well lighted, and there is practically no danger 

 that the light will be interfered with. 



Entering from the street, we find ourselves 

 in the corridor of the first floor. On the left 

 is the gas-analysis room, so situated that the 

 direct light of the sun cannot enter it. It is 



1. — North end of the .tohns hopkins chemical laboratory, facing the street. 



end presents a frontage of fifty-five feet on the 

 street. A view of the street end is given in 

 fig. 1. It extends back from the street about 

 one hundred feet, the back part being eleven 

 feet narrower than the front. It is built of 

 the finest pressed bricks, and ornamented with 

 a bluish sandstone, and presents a handsome, 

 substantial appearance. On the east is one of 

 the university buildings, containing the general 

 library. The south end receives light unob- 

 structed^ 7 , the nearest building being some- 

 what more than one hundred feet distant. 

 The intervening space is the propert} T of the 



full}' equipped for all kinds of analytical work 

 with gases. The apparatus of Bunsen, and 

 the more rapid though less accurate apparatus 

 of Hempel, are always ready for use. The 

 floor, the joints of which are laid in white lead, 

 is made of carefully selected strips, and thor- 

 oughly oiled and waxed. Further, it slants 

 slightly from all points towards one corner of 

 the room, where there is a box at a lower level, 

 containing a bottle arranged so as to catch any 

 mercury that ma} 7 be spilled. Next on the left 

 there is the photometric room. The walls of 

 this room are black, and the windows are pro- 



