9 



THREE KINGDOMS. 



utterly impossible to determine the sender of a pack- 

 age, or to know what to send in return. Tie the 

 parcel strongly, but do not seal it, unless you wish to 

 pay letter postage. One or two fine specimens are 

 always more acceptable than several inferior ones; 

 No propositions for exchange can be noticed in The 

 Swiss Cross, excepting from subscribers, or from mem- 

 bers of the A. A. For this, among other reasons, it 

 is necessary for us to keep a full register of all mem- 

 bers, and names of new members should always be 

 sent us at once. 



Whenever any one writes proposing an exchange, 

 courtesy requires him to enclose a stamp for reply. 

 Requests of this nature should always be promptly 

 answered. Aim to give rather more than you receive. 

 A grasping spirit of trade is utterly foreign to the 

 nature of a true scientist. 



