limits.| millions.| thou-| 101)| | | 68) | | | |sands.| | | | | | -------------------------------------------------------------------- The above table represents in each case the average of a large number of counts. REMARKS. _Frog._--The _red cells_ are large oval nucleated (20-25µ by 12-15µ) discs, the nucleus relatively small and irregularly elongated or oval, about 10µ in length. Many primitive and developing forms are usually observed--also free nuclei and many cells in various stages of degeneration. Hæmoglobin estimation is difficult owing to turbidity of the blood after dilution with water. The _polymorphonuclear_ leucocytes are large cells, about 20µ; no definite granules can be observed. The _eosinophile_ cells contain large deeply staining coccal-shaped granules. _Mouse._--The granules of the _polymorphonuclear_ leucocytes are usually not stained, or only very faintly so. The nucleus of the _eosinophile cell_ is ring-shaped or much divided, and the granules are coccal and stain oxyphile. The remarkable character of the blood is the high percentage of large _mononuclear_ cells. _Rat._--The fine rod-shaped granules of the _polymorphonuclear_ leucocytes are usually very faintly stained. The granules of _eosinophile_ cells are well stained and coccal-shaped, the nucleus is often ring shaped. The _basophile_ granular cells are few--but the granules are large, and stain deeply basophile. _Guinea-pig._--Polychromasia and punctate basophilia of _red cells_ are very commonly observed--nucleated red cells are also frequent. The large _mononuclear_ cells often contain vacuoles--"Kurlow cells"--possibly of a parasitic nature. _Rabbit._--It is not uncommon to find nucleated _red cells_ in films from quite healthy animals. The granules of the _polymorphonuclear_ leucocytes stain oxyphile. The coarse granules of the _eosinophile_ cells appear to stain less deeply oxyphile, probably owing to the basophile staining of the cytoplasm. _Rhesus monkey._--The blood cells resemble those met with in human blood. The minute neutrophile granules of the _polymorphonuclear_ leucocytes are often very scanty, and sometimes apparently absent. The _eosinophile_ cells are not so densely packed with coarse oxpyhile granules as in the human eosinophile, and the nuclei of these cells are usually much divided, or polymorphous. _Goat._--The _red cells_ are small, nonnucleated discs, only about 4.5µ diameter, not much more than half that of the human red cell. The _polymorphonuclear_ leucocytes have only a few very minute coccal-shaped oxyphile granules, the nucleus is polymorphous. The _eosinophile_ cells are large cells up to 20µ, the cytoplasm is basophile and contains coarse coccal-shaped oxyphile granules, and the nucleus is often much divided.