219 



Rabbits, not infested by parasites of sheep . 14 



Ranges as a source of infection 13 



Salting 13 



Scab 53 



general description of 53 



insects 53 



life history 53 



white-washing and lye water 12 



Sarcoptea scaMd var.ovis 53,54,56 



dqpcription 54 



disease caused by 54 



diagnosis ..., 56 



prognosis 56 



source of contagion 55 



treatment 56 



Sclerosfoma equinum, 161, 162 



Sclci-ostovia htjpostomum 16, 145,167,168 



description 161 



figures 164 



life history 161 



occurrence 161 



Sclerosioma tetracanthum 161,162 



Sheep grub (see CEstrus ovis). 



Sheep industry, value of 9 



Sheep louse (see Tricliodectes aphcerocephalus). 



red headed , 45 



Skin, parasites of 39,45,49 



Sources of information, recognition of 23 



Species abundant in United States 16 



American and European compared 16 



described 17 



destructive 17 



not in United States 16 



of external parasites IS 



rare in United States 16 



Staggers (see Taenia coenurus). 



Stomach round worms (see Strongylus contortus). 



Strongylus contortus 16, 17,20, 22, 117, 118, 141, 146, 202 



description 141 



disease caused by 142 



treatment 142 



figures 144 



life history 141 



the lombriz disease 141 



Strongylus filaria 16,17,20,21,185 



description 201 



disease caused by 203 



duration 203 



tracheal injections for 206 



treatment, medical 205 



preventive 202,208 



figures , 210,212,214 



occurrence 204 



