338 JOURNAL OP ECONOMIC ENTOMOLOGY [Vol. 3 



figure 2 of the same Bulletin are also a part of the exhibit. In one 

 of the jars is the harvest from 4313 straws infested with Hessian 

 fly and in the other the harvest from an equal number of straws not 

 infested with this insect. 



There is an exhibit, similar to the last mentioned, showing the 

 harvest from wheat infested with jointworm as compared with wheat 

 not so infested. 



During the past two seasons there has been quite an exhibit of 

 the work of the two species of bark-beetles most injurious in Ohio, 

 viz. : Scolytus rugulosus, and Phlceotribus Uminaris. Entire trees in 

 various stages of infestation and decay have been shown, as well as 

 breeding jars with beetles at work in various stages of development. 



A device for showing small photographs of important work, spray- 

 ing machines, and economic insects, is a rotary stand, modeled after 

 those commonly used for showing illustrated postcards. There are 

 eight faces for pictures, all of which are covered with glass. (See 

 Fig. 4, PI. 23.) 



Large maps of Ohio are used for showing the distribution and 

 prevalence of injurious insects in some seasons. Silk-headed tacks 

 of different colors are used for indicating localities. Blue-headed 

 tacks were used to indicate the localities from which wheat jointworm 

 was reported in 1908 and on the same map red-headed tacks were 

 used to indicate the reports received in 1909. There were several 

 hundred of these for each of those years. 



Results of entomological work on crops are also shown by the crop 

 harvest. In the illustration of the exhibit, Plate 21, is seen a large 

 crate of apples. Here are shown all the sound apples from a well- 

 sprayed tree and in smaller crates beside the large one are the wormy 

 apples from the same tree. The dropped apples from the same tree 

 were likewise separated, the wormy from the sound. The crop from 

 an unsprayed tree belonging to the same orchard was shown in the 

 same way. 



On either side of the pile of apples was a framed poster and map 

 showing location of the Ben Davis trees in the Stokes orchard, which 

 netted over $1,000 per acre in 1908. This was to show that a solid 

 acre was used and that no selection or gerrymander was employed to 

 find the trees for this acre. 



Similar displays of grapes or other fruits are made if we happen 

 to be working on insects which injure them. 



A number of simple microscopes of the pattern shown in Fig. 4, 

 PI. 22, are mounted on a poplar board which is stained black, and 

 under each is some minute insect, such as a flea or other interesting 



