2'262 Journal of Applied Microscopy 



tion is mixed with 1.5 c. c. of a 1 per cent, aqueous solution of methylen blue, 

 and to this mixture is added 5 c. c. of a 1 per cent, aqueous solution of eosin 

 (extra Hochst). 



Fresh preparations of blood fixed in absolute alcohol are stained in this mix- 

 ture, diluted with from two to four volumes of water for five minutes, without 

 heat, followed by gentle heating for from five to ten minutes. To decolorize 

 the red cells, which are blue after this staining, the preparation is put for from 

 two to five seconds in the following mixture : 10 c. c. methylen blue, 1 per cent.; 

 200 c. c. distilled water, and 0.25 c. c. acetic acid. The preparation is then 

 washed in water, dried with blotting paper, and then dipped for five to twenty 

 seconds in absolute alcohol to dissolve out the residuum of stain, and finally 

 washed in water. 



Red corpuscles stain a delicate rose color, acidophile granules purple, neu- 

 trophile granules rose color, nuclei and Bizzozero's plates bright red violet, pro- 

 toplasm of malarial parasites blue, chromatin of malarial parasites bright red 

 violet. Ernest L. Walker. 



Massachusetts State Board of Health. 



The Museum. 

 V. 



INTERIOR PLAN— Continued. 



Some general dimensions for the halls of a Science and Art Museum, if con- 

 forming to the standard of a many storied building for the former and a single 

 or double storied building for the latter, may be resumed in the following direc- 

 tions : 



SCIENCE MUSEUM. 



Whole length of separate hall sections, 180 to 220 feet. 

 Width of separate hall sections, 60 to 65 feet. 

 Five Stories, - - Height. Six Stories, - - Height. 



1st floor - - 20 to 24 ft. - - - 18 to 24 ft. 



2d 



3d 



8d 



4th 



5th 



- 22 to 25 ft. - . - 22 to 28 ft. 



(gallery) - 15 ft. - - - 15 to 17 ft. 



(not as a gallery) 18 ft. . . . 18 ft. 



22 ft. ... 18 ft. 



(work rooms) 15 ft. - - - 12 ft. 



6th floor - - 12 ft. 



Terminal or central halls, which may be embedded between the larger units 

 (viz., the standard halls), 60 to 70 x 100 to 130 feet. Tower spaces, arbitrary. 

 In cruciform structures, a Rotunda, etc., unites the arms. 



ART MUSEUM. 



Central skylighted court, 150 x 100 x 75 feet (latter dimension to roof or top 

 of arch, if spanned). Surrounding hall, 30 to 50 feet wide, divided by arches, 

 columned doorways, etc., into suitable minor compartments or halls according to 



