July 20, 1917] 



SCIENCE 



61 



ware, umbrella handles, jewelry, brooches, sil- 

 verware, knife, fork and spoon bandies, belt 

 buckles, bat pins, book covers, tail pieces, toys 

 souvenirs, trade marks and many other lines 

 of work. 



It is hoped to publish drawings of these mo- 

 tives as soon as the drawings can be made. 

 Each drawing will be labeled as to what the 

 specimen is, where it was found, where it is 

 now, its size, material, and, to a certain ex- 

 tent, with the region in which the type of mo- 

 tive is found. The area in which each motive 

 is found is given, so, for instance, that a Brit- 

 ish Columbian manufacturer may know which 

 motives are appropriate for British Columbian 

 manufactures rather than use one appropriate 

 only for Manitoba. Some of these areas ex- 

 tend into the United States as does the area of 

 the maple leaf and the beaver; others are con- 

 fined to parts of Canada. Reference is made 

 to photographs, lantern slides, and published 

 illustrations wherever such exist. The actual 

 specimens are scattered in this museum, the 

 Provincial Museum at Toronto, Provincial 

 Museum at Victoria, the Museum of the Nat- 

 ural History Society, St. John, New Bruns- 

 wick, the Provincial Museum at Halifax, the 

 American Museum of Natural History, New 

 York, the Museum of the University of Penn- 

 sylvania, the British Museum and museums in 

 San Francisco, Florence, Italy, Berlin, Ger- 

 many and elsewhere. 



If this publication is issued it will no doubt 

 be sent to every large library, every member 

 of Parliament, every newspaper in Canada, 

 probably, to all Canadian manufactures using 

 designs and certainly to all such manufac- 

 turers who express the need for it. 



As it may be months before all the draw- 

 ings can be made the archeological office will 

 make every effort to give free of all expense 

 any practical aid that it can in the use of 

 these motives. These data are at the service 

 of any manufacturer who desires to call at 

 the office. Possibly photographs can be made 

 of a few of the motives for such manufac- 

 turers as specify just what they would like 

 to have photographed. A typewritten list 

 of the books containing pictures of some of 

 the specimens will be supplied on request. 



The office will do all in its power to hasten 

 this work and will be obliged to manufac- 

 turers if they will call or write to offer sug- 

 gestions and express their needs. Such an 

 expression will very likely be of service to 

 the office in securing the improvement and 

 hasty publication of the album of motives. 

 Harlan I. Smith 



Geological Survey, Canada 



methods and materials for the prep- 

 aration of wall charts 



Various grades of paper, with or without 

 cloth-backing, have been used extensively for 

 many years in making charts to be used in 

 lecture rooms. However, unbacked paper does 

 not wear well, and cloth-backed paper is heavy 

 and stiff, besides being expensive. 



Shade cloth is cheaper, lighter, and much 

 more durable than any chart paper. One 

 variety known as Holland Shade Cloth is 

 used by several workers in my acquaintance. 

 A large chart of this cloth may be folded into • 

 a small package or rolled into a close roll con- 

 venient for carrying in a suit case to a meet- 

 ing in some distant city. When unpacked it 

 requires no heavy sticks to make it hang 

 smoothly. 



This cloth furnishes a fine surface for line 

 drawings. The air brush may be used on it 

 in shading, and wax crayons may be em- 

 ployed. However, when large areas of wash 

 shading with a brush are involved, there is a 

 good deal of puckering of the cloth. For this 

 reason, I have made trials of other fabrics in 

 the past three years, and I have found that 

 so-called Peerless Cambric Shade Cloth, Ivory 

 White, is excellent for large wash drawings. 

 It does not pucker noticeably, and it has a 

 good drawing surface. There is no trouble 

 with " di-yiug lines " in applying washes. 

 This cloth is a little heavier and stiffer than 

 Holland cloth, and it can not be packed so 

 compactly without forming creases. I have 

 recently been informed that the puckering 

 may be avoided by mixing equal parts of 80 

 per cent, alcohol and the ink solution em- 

 ployed. 



I have not found it practicable to erase ink 



