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No more published.

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Second reader illustrated by Maud and Miska Petersham; third-fourth reader illustrated by Willy Pogany. Third-eighth reader by Franklin. T. Baker and Ashley H. Thorndike; second reader by Franklin T. Baker, Ashley H. Thorndike and Mildred Batchelder.

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Continued as the American anatomical memoirs.

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Mode of access: Internet.

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[GRAPHICS] A biosynthetic scheme rationalizing the formation of (+/-)-1,7-dioxaspiro[5.5]undecane (5) in the fruit fly species Bactrocera cacuminata and Bactrocera oleae (olive fruit fly) is presented. Incorporation studies with deuterium-labeled keto aldehyde (10), 1,5-nonanediol (11), and 1,5,9-nonanetriol (12), and our previous finding that both oxygen atoms of 5 originate from dioxygen, are strongly evidentiary. The racemic condition of the natural spiroacetal 5 is accounted for, and inter alia, it is demonstrated that dihydropyran (18) is not an important intermediate en route to 5.