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When the larvae affected with Flacherie (Bacillus thuringiensis), the nature of haemolymph and digestive fluid also changes and as a result the cells of the gut wall gets affected. Since haemolymph is a circulatory fluid, with several functions, such as storage and transportation of nutrients and also plays an important role in excretion, defense, moulting and metamorphosis (Mullins, 1985). Nucleated haemocytes number varies with the insects? these haemocytes are classified as prohaemocytes, plasmocytes, granular haemocytes, oenocytes or oenocytoid and spherule cells (Arnold & Hinks, 1976). Major function of haemocytes includes phagocytosis of small particles, encapsulation of large foreign materials, haemolymph coagulation and storage and distribution of nutritive materials. Immune system includes certain types of blood cells. It also includes chemicals, carbohydrates, lipids and proteins. In insects, several types of haemocytes are observed in the haemolymph (Butt & Shields, 1996). Saran et al. (2002) classified the blood cells in the silkworm, B. moriL. and A. mylitta in to six types' viz. prohaemocytes, plasmatocytes, granulocytes, spherulocytes, imaginal spherulocytes and oenocytes. Proteins are the derivatives of high molecular weight polypeptides. They play a vital role in the formation of structures in organisms. Like carbohydrates and fats proteins also can be utilized for energy purpose. In silkworm, blood glucose level can be correlated to their level of metabolism, and is comparable with mammalian blood glucose. Lipids play an important role in the biochemical processes delaying growth and development of insects.