72 ON THE OLDER FORMS OF TERRA-COTTA ROOFING-TILES. 



a picture of the Sienese school, twelfth century, in the National Gal- 

 lery, London, showed a similar tile. The old Dutch masters present 

 the pan-tile, and Teniers shows the angular ridge-tile on a thatched 

 roof). 



Collections of photographs, however, furnish the best material when 

 one cannot visit the country ; the only drawback is that such pictures 

 usually present monumental buildings, often roofed with metal, and 

 it is only by chance that the roof or ridge of some common house 

 comes into the picture. For the photographic and other material I 

 am greatly indebted to the collections of the Boston Museum of Fine 

 Arts, Peabody Academy of Science, Salem, Gen. Charles G. Loring, 

 Mrs. Helen Abbott Michael, Mr. and Mrs. E. F. Waters, Mr. T. F. 

 Hunt, Mr. Sylvester Baxter, Mr. Denman W. Ross, Mr. J. Adamowski, 

 Mr. A. E. Barber, Prof. C. C. Abbott, Mr. Alban Andren, Mr. G. E. 

 Walters and others, whose names are mentioned in the text. My ob- 

 ligations are especially due to Mr. Edward Robinson for calling my 

 attention to numerous memoirs on the Classical antiquities of Greece 

 and for the use of his valuable Classical library. 



