Science Progress, Band 6

acid action adult Algæ ancestral animals anthocyan appears Arachnids Archief beds body cane carbonic acid Carboniferous cause cellulose cent centrosome changes character chlorophyll Choanoflagellata ciliated ciliated cells cœlenterates collar cells colour critical temperature curve described diatoms disease ectoderm effect endoderm epithelium evidence existence experiments fact fibres fibrinogen formation fossil Galeodes ganglion genera germinated glands Glossopteris Glossopteris flora Gondwana important increase isothermal Java Journ lakes larva larvæ latter layer limbs liquid lower lumbar membrane ment metabolism Metazoa method mixture modification molecules nature nerve observations obtained occur organs origin ovum parasitic pectate pectic pectic acid pectose phenomena physiological plants present pressure probably produced protoplasm Protozoa recent regarded region remarkable rocks salts seeds segments serum similar soluble solution species specimens sponges stimulation structure substance sugar sugar-cane surface tail theory tion tissues tube vapour variation varieties Waals zoospores