98 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 2 



whether he has his plates treated Avith the emulsion and whether such 

 plates are on the market? 



Mr. Coolev : No ; they are made 1)y the M. A. Seed Company in 

 gross lots. 



Mr. Washburn : What power lenses do you use ? 



Mr. Cooley : A Zeiss D, I believe, was used on this series of pho- 

 tographs and they are all the same scale of mag-nification. 



A jMember: I would like to ask Mr. Cooley Avhether he thinks 

 photographs will always bring out the surface markings that we can 

 get sometimes by drawings. I think, with certain insects, like scale 

 insects, we want to get an accurate representation of the insect as 

 it appears. 



Mr. Cooley' : That is true. There are many kinds of illustrations 

 in which drawing only will bring out what is desired. However, any 

 one who has attempted to draw scale insects will realize that in the 

 Diaspime it is very hard to bring out anything like what is wanted 

 in a draM'ing. 



A Member: I think the two things have been reversed recently. 

 That is, the drawing was the primary thing in times gone by. and 

 it ought to be relegated to the second place. That is to say, it should 

 supplement the photograph, if necessary. 



]Mr. Felt : It seems to me that the making of photomicrographs is 

 one of considerable importance, and I believe that quite a few have 

 been deterred from attempting work along this line because of sup- 

 posed difficulties. I want, for just a moment, to outline an apparatus 

 which we have used *at Albany, N. Y., with a good measure of suc- 

 cess. We were situated so that we did not think it advisable to put 

 a considerable amount of money into special lenses, or upright 

 stands, or anything of that kind. We simply used the ordinary mi- 

 croscope, put it in front of a long bellows, and used a Welsbach 

 lamp, and put a boy at one end to manipulate the slide and micro- 

 scope, and a man at the other end, to give directions so far as ad- 

 justment was concerned. In that way, we were able to make a pretty 

 fair series of photomicrographs. We could have made them better 

 if we had had better equipment, but we found that in ordinary en- 

 largements, fifteen, twenty, twenty-five or thirty diameters, we could 

 make, with that make-shift apparatus, ten or twelve pretty good pho- 

 tomicrographs in an hour, with one man and a boy to attend the 

 microscope. If you wish to get an idea of the work done by this 

 outfit, I would simly refer you to Museum Bulletin No. 79 (N. Y.), 

 illustrating some mosquitoes. I am satisfied that we can use ordi- 

 nary lenses and work in the daytime. We all have practically that 



