O in a different manner from that of the (iiid-Uies which afflict horses and cattle—lodg ing them in the flaps of the sheep's nostrils, where they soon become vivified by the heat and moisture. The larva, or maggots thus hatched, next tnake their way into the frontal sinuses situate between the eyes. These larver in t lie course of their progress, give great pain to the animal—crawling upward by means of two small hooks which grow out from the i sides of their hrads. By means also of these nooks they fasten themselves when they reach their abiding place, aud here for months, feed upon the mucus secreted by the Using mem brane of the chambers they have chosen. To ward Spring, they have growu to about au ch in length, flattened somewhat, ami pre rrnting eleveu rings or apparent joints, which I tie microscope shows to me edged with a few thort bristles. When they have become mature w a worm, (usually iu March,) they begin to retrace their pathway, which again brings ag ouj on the poor animal whose brain they have finis invaded. It stamps its fePt, tosses its ! -ad about, sneezing violently, and so com in t ! u r , until its enemy is expelled at the nostril AUer expulsion, the maggot crawls off, finally burying itself in the ground, where it assumes I ( he impa form, out of which a new fly is hatch ed, to go the same unwelcome round of life. Amongst writers on the6ubject, various, and w Suithe injury these worms inflict on the amunl; nd the manner in which they produce ' ■'di. Ipou the whole, it would seem that * 1 a fer J large number of worms are gen :rau'd, tfaey produce irritation and inflamation " ' ie head— possibly on the brain, and thus oy tlirir victim. A very few might not I 'tie tliH result. Sev ral writers of note Jli ® :l ' Economy, appear to class this fly Rn.oi.gst the more harmless enemies of sheep ; 'e ancients deemed t hem bred iu the brain— Hi did is cerebri