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<head xml:id="echoid-head261" xml:space="preserve" style="it">16. Lux & color reflectuntur per line{as} phyſic{as}, latitudine quadam prędit{as}. 3 p 2.6 p 5.</head>
<head xml:id="echoid-head262" xml:space="preserve" style="it">17. Reflexio lucis & coloris à ſuperficie aſper a facta, plerun fugit uiſum. 1 p 5.</head>