. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Microcomposition of some fossil insects 235. Figure 5. X-ray powder picture of celestite from one insect. Figure 6. X-ray picture of entire (a) insect head and (b) insect body. be made only after the specimen had been powdered. It is particu- larly interesting that a mass of such relatively big crystals can faith- fully reproduce the small details of structure in an insect they mineralize. The results we have described above are in accord with those given by Palmer (1957), including X-ray obse
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Microcomposition of some fossil insects 235. Figure 5. X-ray powder picture of celestite from one insect. Figure 6. X-ray picture of entire (a) insect head and (b) insect body. be made only after the specimen had been powdered. It is particu- larly interesting that a mass of such relatively big crystals can faith- fully reproduce the small details of structure in an insect they mineralize. The results we have described above are in accord with those given by Palmer (1957), including X-ray observations which he states were carried out at the Geological Survey in Washington. Most of his mineral identifications were made by the usual petrographic procedures; nevertheless we believe that the added information the foregoing examples provide, demonstrates that the physical tech- niques we have been describing can contribute very materially to the further investigation of these and other insect fossils. Acknowledgments We are indebted to Stephen Dye for much help in the photography and microradiography of specimens. This work has been carried out with support from National Insti- tutes of Health Grants Nos. 5 ROl DE01919-03 and 5 TOl DE00126- 04 and National Science Foundation Grant Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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