STUDIES ON MUSEUMS AND KINDRED INSTITUTIONS. 525 



ance is caused l)y frost and melting- ice. In most respects the climate 

 is milder than with us, though single windows are found also in manj^ 

 other European museums as well as in the large museums of the 

 United States, where the winters are very cold. In the newly-con- 

 structed Natural History Museum in Brussels, however (see p. 597), I 



Fig. 83.— Musciun of Natural History. London. Side gallery containing fossil reptiles. Skeleton of an 



Iguanodon in the foreground. 



found double windows with a very considerable space between the two 

 lights. The Director was of the opinion that the great hall (S-t by 30 

 meters) could not be heated without the doul)le windows. I do not 

 share this opinion, for in the present day any room can be well heated. 



