48 The Ottawa Naturalist. [June-July 



be made on this same principle, by substituting frames 

 with glass in place of the wooden sides of the cases, it 

 being only necessary in such cases to carry the sides up and down 

 from the top and bottom of the frame in the same manner that 

 the front and back is carried up and down. If the case is so 

 large, as for habitat groups, that it is necessary to have more than 

 one frame, a mullion to which to screw the frames may be in- 

 serted between the top and bottom of the case where necessary, 

 but this should not project sidewise beyond the wooden frame. 

 By this means the amount of wood exposed to view is kept at a 

 minimum, whereas in many cases such as we often see, the mul- 

 lion is exposed to view and the frames are on each side of it, 

 making three thicknesses of wood to obscure the exhibit instead 

 of only two. If desired, a moulding can be screwed over the 

 crack where the frames meet, and if fastened to one of the frames 

 that frame may be taken off first in opening and closing the case, 

 which will save the trouble of unscrewing the moulding. 



In the simple cases the front and back sashes may all be 

 made the same size; where the cases are not very deep and 

 sashes are tised in the sides, it will of course be necessary to 

 have a smaller size of sash for the sides; but if the cases are 

 very large this will not be necessary, although it will make any 

 attempt at a square case as much longer than it is wide as twice 

 the thickness of the sash, unless the frame at each corner laps 

 the same direction. 



One of the simple forms of these cases three feet wide by 

 one foot by seven feet, was made, with the exception of the 

 frame and glass, by two carpenters, during the time which they 

 could take from other work in a single day while assisting in 

 reorganizing the Rocky Mountains Park Museum. It was 

 thought that the frame and glass could be put on later The 

 case was wanted immediately and an exhibit was installed in it 

 as soon as it had been given a coat of stain. This seemed a 

 fair test of the cheapness, ease and speed with which such cases 

 could be made available. 



The specifications which have been made by Mr. P. A. 

 Taverner to accompany this description are for a somewhat more 

 complicated and slightly more expensive case, and consequently 

 a number of the dimensions and methods of construction are 

 slightly different. 



SPECIFICATIONS.— By P. A. Taverner. 



Material — Lumber. 



All material in case to be of clear, white pine, whitewood 

 or other material most readily obtainable in locality, in clear 

 lengths free from large or unsound knots or shakes. 



