Note 10 — PART I.—MORPHOLOGY AND PHYSIOLOGY
Reading edition
Miall and Denny ex Krukenberg; Kolbe gives the formula as C9H15NO6 or C18H15NO12. As the result of his recent researches, Krawkow (Zeits. Biol., xxix, 1892, p. 177) states that the chemical composition of chitin may prove to be somewhat variable.