256 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



0. Insects injurious to stored grain and how to prevent injury. 



7. Insects injurious to cereal grains. 



8. Insects injurious to forage crops. 



9. Insects injurious to garden crops. 



10. Insects injurious to potatoes. 



11. Insects injurious to shade and ornamental trees. 



12. Insects injurious to livestock. 



13. How to treat San Jose scale. 



14. How to treat the Fruit Bark Beetle and other borers. 



15. Wonders of the Insect World (40 minutes night stereopticon lecture, many 

 slides in natural color.) 



16. Some birds and small animals, good and bad; their habits and value (40 

 minutes, night stereopticon lecture, several colored slides.) 



17. Relation of insects to human welfare (40 minutes, night, by H. A. Gossard.) 



18. Spraying machinery (40 minutes night stereopticon lecture, by W. H. Good- 

 win. 



19. Any entomological topic not listed will be discussed if request for the same 

 is made two weeks before the institute. ^ 



In our experience, simple talking without any illustrative material 

 is not satisfactory. We have several ways for illustrating our lectures. 

 For day lectures we make much use of enlarged bromide pictures. Life 

 histories of insects, character of damage wrought by them, comparative 

 results of treatment, different types of insecticidal machinery, etc., 

 are quite susceptible to this kind of illustration. We use pasteboard 

 mounting cards about 20 x 24 inches, or larger, so they easily take 

 plates 16 X 20. These will carry illustrations sufficiently large to be 

 seen readily by all the members of an average institute audience of 

 100 to 500 people. To economize weight we sometimes put a plate 

 on each side of the board and sometimes we mount the plates on sheets 

 of cloth instead of board. To carry these illustrations we wrap them 

 in a cover of oilcloth and put a shawl strap about them. The litho- 

 graphic chart recently prepared by Prof. F. L. Washburn of Minne- 

 sota for use in the schools of his state seemed so well adapted for insti- 

 tute work that I have had this backed with cloth and expect to make 

 more or less use of it in giving the introductory lecture at institutes. 

 Our Ohio institutes are usually for two days, and each worker is gen- 

 erally expected to give four and sometimes as many as six lectures 

 during the session. For evening lectures we make much use of the 

 stereopticon. The Bausch and Lomb Optical Co. have built a port- 

 able lantern according to specifications furnished them by our Messrs. 

 Houser and Goodwin which can be mounted on an ordinary camera 

 tripod and the entire machine with accessories, excepting the slides, 

 can be packed in an ordinary suit case and weigh, when packed, but 

 little more than thirty pounds. 



We use an alco-lite attachment with this machine and find it quite 

 satisfactory. We have also an electric lantern which we use in build- 



