Figure 1 shows how the box is made.  It should be 4 in. wide and 6 in. high

[Illustration:  A Good Trap for Small Animals]

on the inside.  The top and bottom boards project 1 in. beyond the side boards at the back and the end board is set in.  The top board should be 2 in. shorter than the sides at the front.  Nail a strip on the top board back of the door and one on the bottom board so the game cannot push the door open from inside the trap and get out.

In the middle of the top board bore a hole and put a crotched stick in for the lever to rest on.  Bore another hole in the top of the door for the lever to pass through.  Two inches from the back of the box bore a hole for the trigger, which should be made out of heavy wire in the manner shown in Fig. 2.  The door of the trap must work easily and loosely.

** Novel Electric Motor [395]

The materials necessary to make this motor are an old electric bell of the “buzzer” type and a cogwheel from an old clock.

Remove the hammer-head and gong from the bell, then bend the end of the hammer into a loop, as in Fig. 1.  Now make a little wire catch like Fig. 2, and fasten its loop into the loop of the hammer.  Mount the bell on a small board as in Fig. 3 and fasten the cogwheel almost on a line with it.  Now press down the hammer and place a nail in the position shown in the diagram so that the catch touches one of the teeth.

Fasten the board in an upright position and attach two dry batteries to the binding-posts.  If properly connected, the fly-wheel will turn quite rapidly and with amazing force for so small a machine.  The machine, however, has a fixed direction as shown by the arrow, but the belting can be arranged so as to send the models in a reversed direction if required.  The materials for the motor should not cost more than

[Illustration:  Novel Electric Motor]

25c for the bell and if you have an old bell it will cost next to nothing.  —­Contributed by Fred C. Curry, Brockville, Ontario.

** How to Print Photographs on Silk [396]

Silk, satin or any other fine material can be used to make photographic prints, but the most attractive results for the amateur are obtained on silk, the best color for this purpose being either cream or white, says Photography.  The chemicals required are only four in number, and a comparatively small amount of each will suffice, so that the process can be tried without any very great outlay.

A dram of dextrine is mixed with 2 oz. of water and allowed to dissolve.  It is then made up to 4 oz. with boiling water, and, when cold, a solution of 1 dr. of ammonium chloride in 2 oz. of water is added.  As this mixture does not keep well, it should be used as soon as possible after being made up.

The silk is soaked in the liquid until it is thoroughly saturated, which should take about four or five minutes, and it is then hung up to dry, suspending it, tightly stretched, from its two top corners.  The fabric when “salted,” as this operation is termed, will keep indefinitely.  All these operations can be done in daylight.