EXPERIMENTS AND PRACTICAL WORK 71 



The list should be added to from time to time, and it is 

 suggested that the teacher should compile the list, and 

 should encourage the children to report pests noticed by 

 them. 



Expt. 144. Remedies. 



(a) Handpicking. Each child should take part in hand- 

 picking caterpillars, beetles, &c, which attack plants in 

 the School Garden or at home. 



(b) Spraying with Paris Green for Biting Insects. The 

 teacher may himself show the elder children how Paris 

 green should be used if a suitable occasion offers. As 

 this remedy for caterpillars and other foliage-eaters is a 

 deadly poison, it should only be used where the utmost 

 precautions are possible and will be taken. 



(c) Kerosene Emulsion 1 for Sucking Insects. Wash the 

 portions of a plant badly covered with scale insects, or 

 with thrips, with kerosene emulsion. Kepeat treatment 

 in twelve days. 



Expt. 145. Natural Enemies of Insects. Make a list 

 of any birds, reptiles, or any other animals that you have 

 seen catching insects. 



Expt. 146. Parasites upon Animals. Make a list of 

 any small parasites that you have observed living on 

 domestic animals. 



Expt. 147. Ticks. 



(a) Collect as many different kinds of ticks as you 

 can, and make drawings of them. 



(b) Put a large engorged silver tick in a well-corked 

 bottle, and leave until she has laid her eggs. Keep 

 until the eggs hatch into grass-lice. Kill all with boil- 

 ing water. 



1 ot preparation of insecticides, see Suggestions for School Gardens, p. 144. 



