He wishes to acknowledge the help he has already received from members of his staff, particularly Dr. Van Dyke in Coleoptera, Prof. Herms with the parasitic forms of all orders, Mr. Bridwell in the Hymenoptera and Mr. Coleman in the Coccidse. The Thysanoptera have been revised for this book by Mr. Jones. C.W.Woodworth. Berkeley California. August 1913. ferentiations of the cellular layer results in the division of the digestive tract into a series of organs as follows:-Stomodaeum. 1. Pharynx or mouth cavity, often partly closed by the thickening of the * « g p^<0 9 cc o-H-p gfa 09 P-i 9-S 09
ALL the elementary text-books in physics are still using an equation for the conjugate foci of spherical lenses which is too inaccurate for the calculation of microscope objectives, applying with approximate accuracy only to very thin lenses. The same equation is all that is given in the more advanced treatises except those securing a closer approximation by the methods of higher mathematics.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.