and Laboratory Methods. 2423 



and the architectural features be repressed to the limit of some sort of exterior 

 comeliness. 



Fig. 35 shows a permissible decoration of windows without any perceptible 

 or serious interruption of their functions. It is the north side of a west wing of 

 the New York museum. 



The question of stained glass windows in museums may also be alluded to 

 here. There seems no reason why stained glass should not be used in museums 

 where its use, incontrovertibly, does not mar exhibits, or in positions where 

 its use is purely decorative and symbolic. Art museums might make very 

 free use of stained glass in stairways and entrances, and, while an expensive 

 embellishment, its beautiful effects would lend themselves appropriately to the 

 aesthetic purposes of an art museum. 



In view of the very general use of top-lighting in art museums, a wider lati- 

 tude is permitted to the architect in the treatment of the exterior walls, and, as 

 the objects are often of large size (sculpture, antiquities, etc.), where side light- 

 ing is adopted, the windows may be advanced to a very considerable importance 

 in the purely architectural conception of the buildings, or their natural purposes 

 be somewhat veiled by the construction of a peristyle, as in the very impressive 

 fagade of the London Art Museum (Fig. 36). 

 American Museum of Natural History. L. P. GratacAP. 



A Review of the Methods of Staining Blood. 



X. 



IV. THE TECHNIQUE BEST ADAPTED TO SPECIAL PURPOSES. 



In staining the blood, as in staining other tissues, the simplest method that 

 will clearly differentiate the required structure is the best. No advantage is 

 gained by the use of a double or triple stain when a single stain will accomplish 

 the required result, and they may mask the feebler reactions of the primary stain. 

 But a contrast stain is sometimes needed to ease the strain of the eyes in making 

 differential counts. It is often advisable to first stain with a neutral compound 

 dye and then confirm such of the elements of the blood as may be necessary with 

 simple dyes. And the elementary student of the blood and the pathologist wish 

 the complete structure of the blood exposed before them ; the student, that he 

 may see the different components of the blood and their relation ; the pathologist, 

 that he may see any abnormal changes in the blood. 



1. For Differentiating the Structure of the Blood. — The neutral eosin-methylen 

 blue dyes (III, D, 5) ^ stain differentially all of the histological elements of nor- 

 mal and pathological blood. Fixation is either accomplished in the process of 

 staining or is described in connection with the method of staining. 



Ehrlich's tricolor stain and its modifications (III, D, 4) stain all of the normal 



References are to sections where the methods are described. 



