Ohio Journal of Science: Volume 67, Issue 3 (May, 1967)

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Front Matter
pp 0
Article description | Article Full Text PDF (901KB)

The Propinquus Group of the Crawfish Genus Orconectes (Decapoda: Astacidae)
Fitzpatrick, J. F., Jr. pp 129-172
Article description | Article Full Text PDF (3330KB)

Conversion Yields of Some Photographic Emulsions and Related Factors
Gebel, Radames K. H.; Duke, Gary L. pp 173-183
Article description | Article Full Text PDF (740KB)

Book Review
pp 183-183
Article description | Article Full Text PDF (64KB)

A New Species of Draeculaacephala (Homoptera-Cicadellidae) from Chile
DeLong, Dwight M. pp 184-185
Article description | Article Full Text PDF (125KB)

Book Review
pp 185-185
Article description | Article Full Text PDF (68KB)

Records of Ohio Fleas (Siphonaptera)
Humphreys, J. G. pp 186-190
Article description | Article Full Text PDF (327KB)

A Test for Penicillins on Chromatograms and in Spot Tests
Goldman, Margaret; Day, Richard A. pp 190-191
Article description | Article Full Text PDF (121KB)

Rare Birds at Lake Saint Marys, Ohio
Sipe, James P. pp 191-191
Article description | Article Full Text PDF (50KB)

Book Reviews
pp 191-192
Article description | Article Full Text PDF (151KB)

Back Matter
pp 999
Article description | Article Full Text PDF (756KB)

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  • Item
    Back Matter
    (1967-05)
  • Item
    Book Reviews
    (1967-05)
  • Item
    Rare Birds at Lake Saint Marys, Ohio
    (1967-05) Sipe, James P.
  • Item
    A Test for Penicillins on Chromatograms and in Spot Tests
    (1967-05) Goldman, Margaret; Day, Richard A.
  • Item
    Records of Ohio Fleas (Siphonaptera)
    (1967-05) Humphreys, J. G.
    A check list of Ohio Siphonaptera is presented, with species distribution records listed by city or county. Twenty species and four subspecies are recorded from Ohio. Chaetopsylla lotoris (Stewart), Conorhinopsylla stanfordi Stewart, Doratopsylla blarinae C. Fox, Epitedia wenmanni testor (Rothschild), Stenoponia americana (Baker), Peromyscopsylla scotti I. Fox, and Oropsylla arctomys (Baker) are new state distribution records.
  • Item
    Book Review
    (1967-05)
  • Item
    A New Species of Draeculaacephala (Homoptera-Cicadellidae) from Chile
    (1967-05) DeLong, Dwight M.
    A new species of Draeculacephala, D. chilensis, is described from Chile, this species is in DeLong collection.
  • Item
    Book Review
    (1967-05)
  • Item
    Conversion Yields of Some Photographic Emulsions and Related Factors
    (1967-05) Gebel, Radames K. H.; Duke, Gary L.
    A method is presented for the determination of the effective average projected grain diameter (d-a) using visual analysis of enlargements of Kodak Tri-X Pan and Kodak Royal-X Pan emulsions. Each was exposed to three light sources of color temperatures 6100°K, 2850°K, and 2040°K, and was developed in Kodak developers HC-110, DK-50, and D-19 for 5, 8, 12, and 20 minutes at 68°F. For 5- to 20-minute developing times, dA was determined, from a total of over 12,000 counts, to be from ~ 2.1 to ~ 2.4 u for both films. A method for calculating the conversion yield -q (number of grains to total number of quanta focused on the emulsion) is derived. The value y is a function of film density (D); it was found that rj first increases and then decreases, and a theory which explains this behavior in connection with grain formation is proposed; that is, 77 is the result of a superposition of an increasing and a decreasing function. The first is caused by the fact that a photographic nucleus made up of three silver atoms has a lesser probability for development than a four-atom nucleus, where with the increased exposure (number of quanta per unit area), the ratio increases in favor of the latter, resulting in an increasing function. However, the photographic plate, unlike the photoemitter, is a "non-speciereplacing" device; as a result, the percentage of nonactivated silver halides decreases with exposure, making the latter a decreasing function. Typical values for 77 showing this behavior are: Tri-X Pan; 6100°K, spectral region 375 to 700 m/x; HC-110, 8 min, 68°F; ij~0.1% at D = 0.10, T7~O.3% at D = 0.30, rj~0.1% at D = 1.00, and' ^ 0 . 0 0 9% at D = 2.00. For A = 466 mn (peak of P-ll phosphor), r, increases from ~ 0.09% at D = 0.10 to ~ 0.4% at D = 0.40, then decreases to ~ 0.2% at D = 1.00 and ~ 0.01% at D = 2.00.
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    The Propinquus Group of the Crawfish Genus Orconectes (Decapoda: Astacidae)
    (1967-05) Fitzpatrick, J. F., Jr.
    Nine species and subspecies assigned to the Propinquus Group, Propinquus Section, of the crawfish genus Orconectes are evaluated on the basis of 1226 specimens examined. Eleven characters are analyzed statistically and 12 more qualitatively, principally by determination of comparative frequencies. O. jeffersoni is judged specifically distinct from O. propinquus and the conspecific O. s. sanborni and O. s. erismophorous. All other taxa of the Group are distinct species. A new species from Iowa is diagnosed, but not described. Two distinct subgroups, Propinquus and Sanborni, are proposed and diagnosed. A lectotype and paralectotypes were designated for Cambarus obscurus Hagen and for Cambarus sanborni Faxon. Standard taxonomic characters in crawfishes are discussed briefly with particular reference to the Propinquus Group.
  • Item
    Front Matter
    (1967-05)