THE FIRST COLLECTING TRIP. 29 



the following day. If the excursion is made on 

 Saturday the insects can be kept soft in this way till 

 Monday. 



Fig. 6. — Poison ivy. (Note that the leaflets are in threes, and that each has 

 only a single midrib.) 



If a cyanide bottle is wet inside it should be 

 wiped out and a piece of blotting paper placed in it. 

 But if the dampness is due to the dissolving of the 

 cyanide it is better to put enough dry plaster of Paris 



Fio. 7.— Virginia creeper. (Note that the leaflets are in fives.) 



into the bottle to absorb the liquid ; sprinkle the 

 plaster of Paris carefully on top of the layer of 

 cement in the bottom of the bottle, so that the whole 

 shall form one solid layer. 



To the Teacher. — If poison ivy or poison oak 

 abounds in the region where the pupils are to col- 



