100 



4. Put them in Labaraque solution with the upper surface 

 of the wings down, and leave them there till the color has 

 been removed from the scales. If a wing bleaches slowly, 

 the process can be hastened by dipping it in the dilute acid 

 and returning it to the Labaraque solution from time to time. 

 This solution can be procured of most druggists. It deteri- 

 orates if left exposed in strong sunlight. If it cannot be ob- 

 tained use an aqueous solution of chloride of lime. 



5. When a wing is bleached, put it in alcohol and leave it 

 there till after it floats. This is to wash off the Labaraque 

 solution. The wing can then be mounted on a card. But it 

 is better to mount it as described below. 



6. Transfer the wing to a clearing mixture, if it is to be 

 mounted in balsam, and leave it there five or ten minutes. 

 This is to remove any water there may be on it. A good 

 clearing mixture can be made by mixing two parts by measure 

 of carbolic acid crystals and three parts of rectified oil of 

 turpentine- 



7. Put the wing on a glass slip with considerable clearing 

 mixture under it to avoid bubbles ; put Canada balsam on 

 top, and cover with a cover glass. In the case of small wings, 

 it is best to transfer them from one solution to another, and 

 to the glass slip by means of a camel 's-hair brush.* 



Wings bleached and mounted in this way make an im- 

 portant addition to a collection. The slides should be care- 

 fully labelled ; and the insect from which the wings were 

 taken should be kept with the slide. It is our practice to re- 

 move always the wings from the right side, and then to mount 

 the slide in the collection at the right of the insect from 

 which the wings were taken. Uniformity in this respect adds 

 greatly to the appearance of the collection. 



* In the case of very small wings, as those of Tineids, the very fine veins are 

 more distinct when mounted in glycerine-jelly than when mounted in Canada 

 balsam. 



