SENDING SLIDES B Y POST. 3 1 1 



to be obtained of any optician, tie it securely with fine 

 string and pack in a black paper wrapper. Attach a 

 luggage label to one end, upon which is to be written the 

 full address, and upon it place the postage stamps. No 

 writing of any kind should be put upon the box itself in 

 order that it may reach its destination in safety. The whole 

 when ready for the post should appear as in Fig. 257. 



